Tricep push ups
Primary muscle: Triceps
Make sure hands are closer than shoulder width to engage the entire tricep in the exercise. Chest should be lowered almost completely to the ground. Maintain controlled breath by taking inhalations on the lowering of your body and exhalations as you press your body back up into starting position.
If you are new at this exercise and do not have the strength to perform it, you can either bend your legs at the knees to take off resistance, or perform the exercise against the wall instead of the floor. For more advanced lifters, you can place your feet at a high surface such as a bench in order to increase the resistance.