The Triceps Dip
Step 1: Sit at the very edge of a sturdy desk or a non-rolling chair.
Step 2: Place your hands on either side of your body and grip the edge.
Step 3: With your feet planted on the floor a step or two away from the desk or chair, straighten your arms to lift up your body.
Step 4: Bend your arms to reach a 90-degree angle so that your body dips down.
Step 5: Hold, then straighten your arms while keeping your body raised above the desk or chair.
Step 6: Do 8-10 reps.