Primary Muscle Group: Core Muscles
Muscle groups worked in this exercise: Abdominus Rectus, Internal and External Obliques, Triceps
Preparation: Kneel on the floor with the ball about a foot in front of you. Both forearms are placed upon the top of the ball, palms together and fingers interlaced. Pull your navel up close to your spine.
Breathing: Exhale as you lift your knees, Inhale when you return knees to the floor. Breathe normally while holding the plank position.
Execution: Try this little change to really firm your upper body and tone your abs - lift your palms and balance on the backs of your upper arms. Remember to keep your back straight and yes, keep those abs tight!