[masraum]

When I was a kid I'd jump down from 5-10'. I noticed that in my mid 20s, my brain would tell me "you probably shouldn't do that."

When I was a kid, I climbed, ran, rode, jumped and played all of the time. I was relatively strong and agile. By the time I was in my 20s, I was still reasonably fit, but not as fit. And it takes a combination of muscle strength in your calves, legs, and butt to jump down so you act as a shock absorber. I remember jumping off of the top of a platform that was about 5' up in my 20s. My brain was telling me "no" but I was thinking "that's nothing, I've got this." I landed with my legs straight. It was not fun. I was smarter after that. A few years back, I was cycling and did an MS150. I was able to perform a couple/few jump downs that I probably wouldn't have in many of the preceding years because my legs were stronger.