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Plank

Primary Muscles Worked: erector spinae, rectus abdominis (abs), and transversus abdominis

Begin in a standard plank position with your forearms on the floor. Make sure you keep your entire body, including your head, in a straight line as you perform this exercise.

Plank 2

1. Begin in the plank position with your forearms and toes on the floor.
2. Keep your torso straight and rigid and your body in a straight line from ears to toes with no sagging or bending.
3. Hold this position tightly, engaging your abdominals, for as long as you wish.