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High reverse plank. A bodyweight core and lower-body exercise. There is no target muscle. Your gluteus maximus, erector spinae (which run up your spine), hamstrings, rectus abdominis, obliques, posterior deltoid, and lateral deltoid all act to stabilize your body. Since there is no movement, the muscles are exercised isometrically. Instructions Sit on the floor with your legs extended and held together. Place your hands behind you, on the floor. Your fingers can point forward, sideways, bac...