For this exercise, you’ll need a small dumbbell, a can of food, or a full water bottle.
Hold the object in your hand. Place your forearm on a table or other flat surface with your hand hanging off the edge—palm facing up. Lift the object using your wrist then lower it back to the starting position. Keep your arm against the flat surface the entire length of the exercise. Do this 10 times. Repeat the motion with your palm facing down.