A

Kneeling with your right side against ball, place right elbow and forearm on top of ball, then lean right hip against ball, placing left hand on left hip. Keeping right knee, shin and top of foot on floor, contract abs to stabilize torso, then extend left leg out to the side so your left instep touches floor [A]

B

Keeping hips and shoulders square, spine in a neutral position, lift left leg to hip height so it's parallel to floor, toes and knees pointing forward [B]. Lower leg to floor and repeat for reps. Switch sides and repeat to complete 1 set.