The ultimate bodyweight move to tone and add definition to your triceps is the tricep dip. Turn away from your gym bench and grab it with both hands, extending your legs in front of you. In a controlled way, lower until your elbows are bent at 90 degrees. Tense your triceps and push yourself back to the starting position. Place a weight on your thighs for a greater challenge.
3 sets of 10 reps are recommended.