Daughter, PCS 1 1/2 yrs, used a standup paddle board to play around on this past summer/fall. The benefit is that it slowly helped her balance which was once excellent but after the fall was somewhat nonexistent.

I know, I know it's winter in most places. Just something to think about when the weather and water starts to warm up.There might be a warm indoor public pool that has therapy hours and will allow use of something similar.