What keeps you motivated?

Ashley
Hi Everyone,
​I recently had back surgery and for the past two months have done aqua therapy as exercise. I've done the same exercises for two months and am getting really bored. I go to aqua therapy once a week and continue with the same exercises in my apartment complex's hot tub? 
​So my question is: what do you do to keep motivated when you can't change the exercises you are doing?  
​Thank you for any advice you give below.