Your triceps makes up about 60 percent of your arm in order to size up on your arm , then you need to get your tricep muscle working. Here are our recommendations for working your tricep to its fullest potential. 1.skullcrusher (3 sets 10-12 Reps) 2.Bench Dips (3 sets 10-12 Reps) 3.Diamond press ups (3 sets 15-20 Reps) 4.Incline Dumbbell chest press (3 sets 10-12 rep 5. Cable Rope Pushdown (3 sets 10 Reps) 6.Standing Overhead Cable Extension  (3 sets 10-12 reps) 7.Straight Arm Cable Pull down (3 sets 10-12 Reps