Our 4 year old grandson loves to constantly jump off furniture, out of his bed, etc. on to the floors, wood, in his bare feet. From heights as high as 31/2 feet.
We are concerned that this might result in problems with his feet or ankles in future years. He is obviously not experiencing any discomfort now when doing this, but we are definitely wondering about the future.
Best, of course, would be for him not to use the furniture as his personal tumbling run, but that's a lot to hope for. Maybe he'd enjoy a tot gymnastics class? Something with crash mats, and instruction in falling safely.