Generally people will use barbells, dumbbells or machines to add resistance to their exercises. Depending on where you add the weight different parts of the body will be pressured with more or less resistance.
For some workouts people will even reposition their body so that gravity is working less against specific muscles. Out of everything gravity plays the biggest role in resistance and in physical development.
In fact, if you were to live in a world without gravity your muscles would quickly diminish and disappear completely. This is exactly what happens to astronauts in space. Because there is no gravity or resistance their muscles do not develop how they should.
NASA is very smart and they have developed a four hour daily workout regimen for their astronauts to prevent muscle atrophy. You may not realize it but every single day the pressure of gravity strengthens your muscles a little bit.
The unique thing that gravity does is it doesn’t just strengthen muscles, but it actually strengthens organs, tissues and even bones. Essentially, it strengthens every single cell in the entire body.
Now you are probably wondering how to get some good gravitational resistance to strengthen the cells in your body. Well, it is actually very easy. You can get in a fighter jet and fly at fluctuating G forces, or, even easier than that, you can get on a trampoline.
There are many different types of trampolines. They have the tramps for Olympic athletes that will rocket the bouncer multiple feet into the air, and then there are personalized trampolines called rebounders specifically designed to benefit one’s health.
See what happens is as you jump into the air you lessen gravitational resistance, and then as you come back down toward the ground or toward the trampoline gravity starts to catch up to you and pull you toward the ground even harder. When you land all that gravitational force that has been pulling you down has culminated into one single push downward equally distributed throughout every cell of your body.
It is kind of like pushups, each pushup would be like a single bounce. However, instead of only targeting a few muscles in the upper torso the bounce actually benefits every cell in the body.
That means that rebounding or jumping on a trampoline can actually strengthen your bones, your organs including your heart, or even your skin. Recreational jumping has been around for years, but it is only recently that scientists have begun to discover all the physical benefits that are association with bouncing, and as it turns out there are a lot.