If toning the back of your arms is a goal ... Come into a plank position with your shoulders over your wrists. Spread your fingers wide. Pull your naval in toward your spine and shift your ...

Start in a tall plank position with your arms extended and your body in a straight line. Jump your feet out wide, similar to a jumping jack, while keeping your upper body stable. Quickly jump your ...

A scratch tool, mounted on a load arm, is moved across the flooring sample, with progressively heavier weight, until a scratch is visible.