Everyone is doing tests on which rebounder doesn't jar you the most. There are review website that seem to have rebounders that are only tested with people that would naturally pick one over the other.
There are websites out there to confuse you into buying a rebounder that you would normally not pick out if you had a chance to try it before purchasing.
Many people think that you need to take out all the ballistic impact from bouncing but most people that are buying rebounders really need them for lymphatic movement do not have an efficient eliminatory system. These people prefer to move lymph and the "health bounce" is the way that is the most efficient way to move lymph. So, if you weight over 250 lbs, you might need a firmer rebounder to give you the a bounce without giving you less bounces per minute or sacrificing G-force.
Someone that is 110 lbs might think that a really soft rebounder is too firm for them. Someone who couldn't pick out a rebounder because they are all too firm will appreciate knowing which is better for their weight for doing lymphatic exercise without over-bouncing with too little G-force or too much bounce since it was too soft causing fewer jumps per minute to get the desired 3 G-force.
So, all the talk and comparisons on "which one is the least jarring" is there to steer you away from the objective. The way to decide on which rebounder to get is to find out how many G forces you want with the least amplitude and frequency of bounces you are trying to get. The more bounces you can get per minute, the more flushing you will get.
The less G-Force, usually the less firm and less jarring when doing high bounces but there can be a major sacrifice in G-Force and if lymph movement is a concern, take these factors into consideration.
Longer springs will make the bounce smoother and lowers the ballistic impact but sacrifices G-force. I do not think this is what people should strive for. The most G-force with as little ballistic impact should be the goal if you are using a rebounder for lymphatic movement. You would not strive for this if only exercise was your concern.
We are TRYING to get G-force, unlike a trampoline, which tries to make the landing as soft as you can get while giving the highest amplitude, or most bounces per minute. The softer bounces tend to be more energy draining and more work in order to get the lymphatic drainage most people want. This is more common on the longer springs. If you want a soft bounce with a standard size spring, you will get the softest bounce but in order to get the responsiveness to do the Health Bounce without having longer springs that you have to jump higher to get this, you will have to change springs.
You can buy a short spring, but that can limit you to ONLY stiffer bounces. The new Cellerciser, for example, gives the G force in tiers. If someone weighs more, they will simply use the extra 2nd tier or 3rd tier, and not the whole spring. If someone is only 110 lbs, it's nice that it only uses the 1st tier and not the 2nd or 3rd tier unless its ONLY necessary. The Needak utilizes the entire spring giving a smooth bounce that does not jar you as it utilizes the entire spring and stretches as much as it needs to without the jarring that most standard sized springs give.
If you are going to go for a stiffer bounce, it should not be jerky (It should not be too hard to cause ballistic impact.
No Jarring at the bottom of the bounce:
A mat that is too stiff will create a ballistic impact at the bottom of the bounce. The way bowling ball hits that mat can be seen. Pay attention to how long the ball is in contact with the mat.
Too Stiff for one may not mean too stiff for another.
Please let us know your weight. If you are 120 lbs you will find a rebounder to be more stiff than another person weighing 180. At 2 to 3 g forces, that extra 60 lbs triples as you jump. Having separate tiers that adjusts to the weight prevents this problem. On a these, a person that is 300 lbs or 120 lbs gets the same bounce, and same g force.
Bounce # VS. G-Force
Which do you want to sacrifice?
"You can get a rebounder that bounces more with more G-force but you want to avoid the ballistic impact rating.
If you are aiming at VERY little ballistic impact, you get a soft, mushy bounce with less G force.
The bounce that most people desire is a bounce that a rebounder can adapt to their weight. If you bounce on the major brand rebounders, you will naturally gravitate towards the most energetic bounce that you can put out more energy per minute due to more contact with the mat with more bounces per minute. The rebounders that gives you the most bounces per minute that gives even sink and rise without using too much expending unnecessary energy to get lift are the ones you will notice instantly if you are picking out a rebounder based on your weight. I do have a quiz to help you decide for any reason you aren't able to jump on all of them before deciding.
Rebounders are not like trampolines in that you want to get as much lift as you can with the least amount of ballistic impact. Rebounders work the opposite.
Firm vs soft bounce
A firm mat will give more a g force. does a firm mat give too much bounce? A firm bounce can give more G force but do you sacrifice the amount of bounces per minute? Tiered rebounders have solved the problem of fewer bounces per minute. The last tier gives the 3 g force the other 2 tiers give the softness. This is how the 2 tiers take out the jarring and the last tiers help give the lymph drainage.
A triple tiered rebounder is made to take out 7/8ths of the ballistic impact in every tier. The tiered rebounder is the one that I have chosen to be optimal for moving lymph. For exercise only, you can get by with a cheaper one as long as the ballistic impact rating is low.
An exaggerated example of a bounce of an aged untuned rebounder is when we put brand new springs on one half of the rebounder and kept the original springs that were used on a rebounder for 2 years. With one half having new springs and the other half having used, older springs, we noticed the difference how the more the springs were stretched the more milliseconds it gave in the belly of the bounce. As the springs become softer with age, most of the tension is spread in the belly of the spring that gives a longer bounce. What is happening is it is absorbing too much of the ballistic impact so that at the bottom of the bounce you get less g force, lowering the expectation of 3 g force.
When the bounce becomes too soft, IT IS TIME TO CHANGE SPRINGS, even if the springs didn't break. You don't just have to change springs when you see a spring hook break. Only a few brands of springs that had high tensile strength showed no difference when we put the old springs on one half and new on the other. These were the springs that manufacturers claimed you don't EVER HAVE TO change springs during the lifetime of their rebounder. On triple tiered springs, it appears that the belly of the spring never stretched out to the point of over stretching because of the two additional tensile strengths. I am still trying to figure out exactly what type of steel alloys they put in the triple tiered springs. The way it is designed gives just the right number of milliseconds of softness before the 3 g force squeeze. People that are heavier engage the 2nd tier as part of this landing phase before the 3rd tier delivers that bottom g force. Lighter people experience the 2nd tier as the bottom of the landing phase. If a child jumps on it, he may only engage the first tier and never the 2nd or 3rd.
If you want a softer bounce or a harder bounce, 2 G forces or 3 G forces when doing the Health Bounce, study the types of springs, short or long bellies, narrow or very wide bellies in proportionate to the length of the bellies, and if the spring quality has a high or low tensile strength to begin with, and knowing what type of bouncing you will be doing, lymphatic or mostly for exercise, or both, will determine what type of rebounder to get that will give you the most bounces per minute with the least exertion (or more exertion if you want). The reason some people don't get much benefit from rebounders is that they just pick out one thinking they all feel the same and deliver the same flush just because they are exercising on it.
Why do some rebounders take less time to get results?
It's not just about how many bounces you get a minute which means how many flushes you get in the one way valves in the lymphatic vessels, it IS ABOUT THE G FORCE ALONG WITH THE BOUNCE. With a heavier spring, like a triple tiered spring rebounder, for example, I don't have to jump so high out of the air to get the 3 G force unlike a rebounder that you have to spring high into the air to get G force. The Lympholine, has very light springs but has spring loaded feet which was the closest to the a tripled tiered spring in that it keeps you very close to the mat when trying to do the Health Bounce. The cheap rebounders many people buy actually can give more than 3 G forces which kills the knees and ankles but the lighter springs don't give enough. 3 G forces when barely leaving the mat seems to be the equilibrium point where most people get the most benefits with the least amount of jarring. Remember, if you have to go much higher than just above the mat to get these 3 g forces, even though a rebounder might be soft, that softness is not what hurts the knees and ankles, it's the coning in and inversion of the feet when the mat has to go down more than you would if you just barely came off the mat.
Those who have health issues, please do not rebound more than 2 minute intervals.
For those who have inflammation or any swelling in the body from a sluggish or blocked, oxygen starved lymphatic system, if you do it more than 2 minutes, all the thickened, dirty toxic lymph cannot be processed by the liver fast enough. If too much gets circulated at once, it can further degeneration and formations of even more toxins that are just moved from the lymph to the liver. Most people are in homeostasis when the body is inflamed. The way to drain the lymphatic system is to do it slowly. The clearing process if done really quick will make most people sick to their stomach. But then again, most people are not getting enough bounces per minute with enough g force anyway because they are working out ones that jar the body and lock the valves in one direction. The Health Bounce on the right rebounder gives that milking motion to clear out the system. With 3 g forces without being airborne too long, 2 minute intervals is more than enough for those just staring out.
The goal is to get as many lymphatic flushing bounces per minute while trying to stay at 3 G forces. The excess time I am in the air is not doing anything nor is not getting enough mat time. If the mat is too soft and sags too much, you might have to jump harder to get the 3 G forces and will be in the air more and have less bounces per minute. If it is too hard for you, it's just the opposite problem.
Before you get a rebounder, know your type of bounce style. Are you going to do edge bouncing or center bouncing. Depending what is natural for you, some people bouncing with their feet closer to the edge and some people bounce more toward the center. If you don't know this can make a big difference in the number of bounces you get when doing the Health Bounce and also the number of free bounces you get and the ratio of air time to mat time. If you are going to buy a rebounder and don't know, my quiz can help you pinpoint the rebounder that will give you the type of rebounder based on your weight and jump style and expectations of the rebounder.
If you study the bowling ball example, you will see that given the same weight on different parts of the mat there are different g forces to the bowling ball. At the softer spots, to get the same g force of the firmer edge on some of the rebounders we tested we had to drop the ball at a higher amplitude to get the same amount of bounces. The goal of this test is to find which rebounder will give the most bounces per minute based on different weights without going out of the Health Bounce range.
HEALTH BOUNCE TIPS:
Health Bounce: You NEVER leave your feet off the mat. (or depending on the rebounder, you might have to jump a little above the mat to get close to the range for the Health Bounce.
A good rebounder let's someone at ANY WEIGHT DO 120 to 130 bounces per minute.
Things that prevent the Health Bounce:
1. Too soft of a bounce. Gives less bounce. Less Resistance = Less lymphatic flush
2. Too Firm. Too much Jarring.
3. Acceleration should come from spring structure, not using muscles to jump in order to create g force. The rebounder should not be too soft nor too firm. Acceleration should enough to give 3 g forces WITHOUT LEAVING THE MAT.
Too much amplitude & with too little resistance CAN KEEP YOU IN THE AIR LONGER, LESS BOUNCES.
3. Too Firm. Can jar you and can prevent you from bouncing for longer times
4. Too much coning. When I look at the bottom I measure how much the mat cones in. Even if there is 3 g forces and the rebounder turns your ankles in, this can make it hard to do the Health Bounce. Many people jump with one foot on the edge and one foot in the middle to prevent coning but this usually throws you back to the center unless you are holding on to the bar. But, this can all be avoided by buying a rebounder that fits you. Kind of liking buying shoes. Since most people can't try them, I try to do all the experiments I can so I can pick out the right rebounder for someone.
Another way of looking at the bounce is how long you get the G forces for. A "flush" or pumping of the one way valves in the lymphatic system needs enough time to close and shut to make it pump. Some rebounders give a more constant force while you are on the mat and some give a more "pop" g force. Both can work but work differently with more or less bounces.
1g..2g.....3g........and then the ascend 3g......2g......1.........
1g..........2g........3g... and then the ascend 3g..........2g.........1g.....
Different rebounders give me a different flush. There are rebounders where you have to jump higher to get the 3 g forces and you have longer times on the mat but also longer times in the air, this gives more of a constant g force. This is similar to being thrown in the air. Totally different than being gently popped into the air. Cheap rebounders pop you in the air too suddenly. I do notice the differences in the smell of my sweat on different rebounders with different g force constants.
A final word on bounce:
You don't want to much bounce, you don't want to little bounce. In my opinion, the best bounce is from a rebounder that adjusts to your body weight no matter where you jump on the mat. You want to get the most benefit out of the rebounder without putting an unnecessary strain on the body. You can get 3 G forces by jumping slightly higher on one that is too soft for you or you can jump slightly lower on one that is more responsive and jump more times per minute. Before picking out a rebounder, it is helpful to decide if you want to only exercise, only do the Health Bounce, or one that is designed to do both. There are some rebounders that were designed with the Health Bounce in mind and others designed just to jog on that you can find at many sporting good stores.
Enough G force
Rebounding with springs that do not create enough G force will have a hard time creating the negative pressure on the lymphatic system, the blood sewer system's one way valves that pump the waste to the liver and then to the intestines to be eliminated. Some rebounders are too soft and do not have enough resistance to cause the negative pressure to build resistance to cause normal cellular respiration. Enough G force is needed to send blood flow to the cell membrane and send new proteins and remove used up blood proteins out. Repetition of G forces when fortifying the cell membranes is where the value is in rebounders that let you do the Health bounce without too much amplitude and few more bounces per minute. A rebounder can bounce you higher in the air, and you might get more G force but you sacrifice fewer bounces per minute, stopping and starting the negative pressure. With a rebounder that gives the Health bounce, the negative pressure never stops like it would on a rebounder that gives you excess air time. The better rebounders can get you enough G force to do the Health bounce without having to jump near the edges where there is more firmness. The heavier the carbon of the spring and the more tapered it is the more a spring will adapt to your weight so you can bounce anywhere on the mat and get similar g force. You might jump more times per minute standing near the edge but different tensions in the tapers in the spring adjust for G force. In the middle of the mat, you can get a softer bounce and less bounces per minute but different the tapers engage and compensate to give you the similar G force as jumping near the edge. Most rebounders jar you the further away you space your feet because the springs have just a single tension though out. A tiered spring will give you the G force at the end of each tier. If you are not heavy enough for the next tension to engage, then your bounce is done and you only use the tiers you need.
On a quality rebounders you should be able to jump anywhere on the mat and not get difference G forces on the mat. If a rebounder gives too much amplitude it will cone in more and invert the ankle and if the spring is not tapered it will have too much tension changes in different sections of the mat which can through you off balance. You should get nearly the same G force near the edge as well as the same near the center of the mat. Only the amplitudes should change.
Notice: With the bungees, you really can't do the lymphatic health bounce. So, if buying a rebounder for lymphatic cleansing is your reason for buying a rebounder, the bungee makes you jump very high out of the mat to get G force that you can't just bounce an inch over the mat and do the Health bounce. It's all about repetition more than G force but their has to be just enough G force to open the one way valves in the lymphatic system to drain lymph.