Key exercise for core strength - the Plank has many variations, as shown by our expert trainers. Thumbnail @christosgaryfallakis #core #corestrength The horizontal plank engages many different muscles across the body. Start with heels back, shoulders above the elbows, flex the quads, tilt the hips slightly forward, flexing the glutes, engage the upper back and shoulders, squeezing the abs, breathing deeply into that hold. Many trainers add movements to their plank, such as these mountain climber

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