Post-surgery, twin toddlers, and I keep falling off the wagon — how do you fit it in?

I did physical therapy for months and stopped when life got busy. I still have numbness in two toes that turns into pain if I walk too far, and I've got about an hour of moving before things start acting up. I go through stretches of exercising for a few days, then life swallows it again. Tennis once a week has been the one thing that stuck the past two months but my tennis partner is moving, so that's ending.

For those of you with small kids: what actually worked for fitting something in? Motivation tricks are great but I am wondering what you physically fit into your day with toddlers around.