I would think squats, or even leg presses, are better, and more controlled, for strengthening the leg muscles. You can take yourself closer to the limit and, therefore, stimulate adaptation.
If someone wants to jump, then why not just do so in the air, and not on something upon which you can miscalculate, stumble and then invite injury? I have sustained enough injuries in my younger (and even not-so-younger) days doing stupid shit, that I now tend to avoid anything that looks like it could end badly.
When I was younger, competing in rowing, college, and then in the military...
Crossfit training was my training to stay in shape for rowing in the off-seasons and to stay in shape in the military. It wasn't popular back then and still not popular today (I think) although its now a sport.
That's what I was doing with my kids before the spectacular jumping portion failure that I was fortunate to not have injured myself although my jaw is still very sore.
See these guys doing it at the 21:30 mark of the below crossfit video...
I need to get mats (stacked on top of each other) as these guys have instead of using stacked weights on one mat.
wrbtrader
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Perhaps yoga. I was watching the new movie "Everything everywhere all at once" and was very impressed by Michelle Yeoh's ability to squat at 59, I'm guessing yoga + cardio.