Lie faceup on the floor, holding a medicine ball in both hands overhead. Lift upper body and legs off the ground, reaching medicine ball toward feet so that body forms a V [above]. Lower, returning to start with torso and legs fully on the floor. Do 3 sets of 12 reps.
Wide Mountain Climbers
Start in high-plank position, wrists under shoulders and body aligned from head to heels. Lift right leg and bend right knee, driving it toward the outside of right elbow [above]. Return to start. Repeat with left leg. That’s 1 rep. Do 3 sets of 20 reps.