The medicine ball alternating V-up is an advanced version of the traditional V-up exercise that targets the external obliques and helps to increase the range of motion throughout your hips and lower back. The additional weight will add strength and stability gains throughout the shoulder complex.
Lie flat on your back with your arms straight behind your head holding a medicine ball with your legs extended.
As you exhale, simultaneously lift one leg and torso off of the floor, bringing your arms forward until the ball touches your toe. Inhale and reverse the movement to return to the starting position. Repeat alternating legs.