This quick 15 minute routine is an ab workout with some tricep kickbacks thrown in! Kickbacks are great for the triceps but often times people go too heavy with their weight and end up not working the tricep effectively. I suggest using a 5 lb dumbbell (10 lbs for guys, 3-4 lbs for beginners) for the kneeling tricep kickbacks. Form is important so remember to squeeze the tricep in the straight arm position at the top of the movement.