Straight-Arm Crunch

Trains your rectus abdominis and obliques (belly muscles and side torso muscles) to contract with great force, developing overhead power for tennis serves, baseball throws, and volleyball spikes.

(A) Lie in a crunch position and hold the medicine ball high above your face.

(B) Raise your head and shoulders off the floor, and hold the crunch for 5 seconds. Do three repetitions.

(C) Alternate this movement to the left and right for three repetitions on each side.