One Arm Dumbbell Chest Press

This is performed on a
Swiss Ball, the negative/eccentric action is performed 4 sec’s, and the positive/concentric action explosive (well as explosive as I could)

Note: We had an accident with this, one of the Swiss Balls burst with my training partner on it pressing 40kg with one arm, after some bruising and swelleing to his hand for a week, he’s surprisingly ok!
Check your balls!