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	            Primary Muscle Group: Core Muscles 
  Muscle groups worked in this exercise: Abdominus Rectus, Internal and External Obliques 
  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: As you lift your knees and straighten your legs, you'll be balancing on your forearms and balls of your feet. If you'd like to make this a little harder, place your legs closer together. Hold for up to 1 minute as you breathe normally.
	            
	            Here are a few suggested alternative exercises:
  Ab CrunchAb Crunch ObliquesBall Crunch TraditionalDouble CrunchDumbbell Side BendsLateral Bend with Barbell
	            
							
							
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