With partner:
100 Seated rotating medball throw to partner
- Switch side after 25 reps

Followed by:

60 Medball ab crunches with throw to partner (each)
- Switch after 10 reps
- With 2 medballs, the other in your hands and the other one on top of your chins, make a crunch and throw the ball to your partner whos standing at your feet. Take the ball (don't roll it) from your chins and partner replaces it with the other.