Before surgery and while I was still able, I did aqua therapy to stay in shape. As I worsened, I focused on more gentle activities like floating and stretching in the water to relieve pressure and weight. It's also easier to gently exercise core muscles without stressing the sacrum in the water.

I was told after surgery that Dr F likes the pool for exercise too following return to activity. However, that is a ways down the road for me - post op instructions include no immersion for a month following surgery, no twisting, and they recommend a slow and gradual return to activity as tolerated among other things.