Serious about packing on quality muscle size with this killer 15-minute body part workout? Get ready. This is a workout designed for individuals seeking maximal muscular development and leanness by tr. Today's workout will be featuring the step bench, dumbbells, and the barbell. We' re getting into the big. Lying Tricep Extensions – 3 x 12. Tricep Dips – 3 x 12 Feb 22, 2016. Triceps Extensions come in all…