How to exercise with a cast on: these exercises might help you out a bit. Feel free to make your own adjustments. I did one minute of each exercise.
Stretches--wrists, arms, shoulders, back, legs
1. Tricep lifts while legs go up and down
2. Love handle stretches
3. Choir directing while toes go up and down
4. Bending legs at the knee
5. Love handle twists
6. Scissor legs
7. Punches
8. Hydrant peeing
9. Sit ups
10. Rowing
11. Leg hold with arm bounces
12. Stomach swimming
13. Bicycles
14. Back kicks
15. Legs and arms apart then together