Intermediate Plank Exercise
Start this exercise in the push up position. Arms should be out in front with shoulders directly over hands, legs straight out behind and resting on tip toes. Keep abdominals engaged throughout the exercise.
Lift one leg up about 5 inches from the mat, and push heel straight back about a foot. Bring foot back and return to to the mat.
Repeat same motion with opposite leg for one full rep, and return to start position.
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