Primary Muscle Group: Abdominal Obliques
Muscle Groups Worked in This Exercise: Psoas Major, Iliocastalis lumborum, Iliocastalis thoracis
Preparation: Lie on ball on side of torso, waist, and hip. Position legs outward with feet on floor or against floor board. Hold medicine ball between hands and close to upper chest region close to your body as pictured.
Breathing: Breath out on the contraction upward and breath back in on the way back down to the start position.
Execution: Raise side of torso up by lateral flexing waist. Lower torso back on ball and repeat. Position other side on ball and repeat with opposite side.
Comments: Exercise can be performed without added weight until more resistance is needed. Movement can be made easier by positioning hip low on ball. In contrast, exercise can be made more challenging by positioning ball lower on hip.