At nearly 48 years of age, I have found the act of jumping to be the most unpleasant body movement. It is as if my hips and the earth have made a secret agreement that they forbid me to be off the ground.
Likewise the second most unpleasant body movement is the act of squatting. It is like the same hips and earth that forbid the jump have a second secret agreement that I shall not lower myself down by the squat.