Tone up your triceps! Everyone wants powerful, well-defined, and sculpted arms.  Triceps make up roughly 2/3 of the muscle mass in your arms, so strengthening them should be your number one priority if you’re looking to score beautiful arms before warmer weather arrives. The Tricep Tone it Up Workout, for all fitness levels, will give you the challenge you need to earn a pair of toned and defined arms without that underarm jiggle.