Or any skill for that matter.
The earlier you develop a natural skill like jumping, the better you get at it and the longer you might be able to do it in life. Injuries notwithstanding, also part of life, the skill comes with a sense of overcoming fear, spacial awareness, elasticity and timing you tend to never lose as you get older.
Yes, you might get a little less spry, a little less springy, but that tends to happen later than if you do nothing about it. Jumping develops full body power, requires a certain amount of flexibility, and is quite useful for emergency situations as well as being practical (jump out of the way of a moving vehicle, over a puddle or a ditch, onto something etc…). And, kids do it, so if kids do it, it means we’re meant to do it, whether it’s for fun,health, survival or other.
During a recent hike at my older son’s favorite hiking spot in Topanga, CA, called Time Tunnel, we had to climb over a variety of rocks or jump from one to the next, or down from one. Depth jumps, climbs, chasm clearance (for the kiddo at least and his perspective). What amazed me was his desire to go “I can do it” as well as “help me” when applicable. He knew to push, but he knew when to not. Like poker, “know when to hold ’em, know when to fold ’em”.
Here’s an example of a distance longer than his height, and drop of about his height. Ah, to have springy joints again…
Now, not pictured here, but when we went back in the afternoon for a second round, kiddo had me crawl through a tiny space between rocks that I didn’t I’d be able to crawl through. He didn’t want to have me go around, he said I had to do it. For him, it was as wide as a Hobbit’s door. For me, it was like squeezing through a mailbox. I made it, and was happy to wear my rugged 5.11 Tactial Stryke pants and a rugged t-shirt (no tears), but more so, I was happy to know that in a pinch, I have enough mobility and snake-ability to get through a crevice smaller than my shoulder width!