Get down on all fours, with your hands flat on the ground directly beneath your shoulders, and your knees beneath your hips with a flat back. Engage your core and drive your right arm straight out from your shoulder, while your left leg drives straight back from your hip, keeping both parallel to the floor. Squeeze your arm and leg back to the starting position, but don’t set them back on the floor. Repeat this movement for 10 reps, then switch to the left arm/right leg.
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