@jeffmarc my understanding is that the bouncing, skipping, small jumps should be done in non cushioned shoes on a hard surface. The cushion cushions the jolt the bones need. I've found Dr Robert Newton's book, "My Exercise Medicine for Cancer" to be invaluable. He also discusses this at the 2025 PCRI conference. His hour long talk is available on YouTube.

@jeffmarc

Any movement that we do standing up is helping since our own weight is putting pressure on our skeleton but if one wants to build bones they need some extra stimulation.

Special bouncing moves are called " Plyometric exercises" and they specifically require bouncing.

Now - one has to start slow ! And one has to know one's own limits. For seniors it is very important to take care of joints and spine and not make any sudden moves without warming up. It is also important to know that moves can be done holding onto railing or chair or any other stable surface if one has trouble with balance. Twisting fast moves should be avoided if one has problems with spine and big jumps avoided if one has painful joints of any kind.

There are numerous videos with plyometric exercise but everybody - please stick with ones for seniors if you have any skeletal issues. There is no need to do advanced moves like jumping onto the step , or twist and jump etc etc - absolutely no need to do those !!!

Bouncing can be done even without jumping off the ground. It is NOT true that one needs hard surface either (as somebody mentioned). Yes- the harder the impact the faster bones "get the idea" to grow, but for seniors slow and steady has the same benefit and prevents injury.

Here is one example of plyometric exercise :
https://www.google.com/search
Please all notice that first 2 exercises do not even require jumping ! Others are gentle bouncing and the last is squat jump BUT the descent is to squat again so there is no hard impact on the knees.

If somebody has trouble with joints it is OK to do this on soft mat. As I said, growth will be slower but it will happen .

If one is regularly involved in sports and has not trouble with joints and has no osteoporosis or osteopenia - than of course do bigger jumps, jumping jack, jump the rope, etc etc.