"Twenty ones" is a very popular way to perform the lying French press
exercise. "Twenty ones" involves performing 7 reps of the first 1/2 of the
range of motion, followed by 7 reps of the second part of the range of
motion of the lying French press along with 7 or more reps of close grip
bench press. The idea is to fatigue the triceps by isolating them with the
Lying French press before performing the compound close grip shoulder press.
Lying French Press 21s are generally used as a 'finisher' exercise as they
usually completely fatigue the triceps so they should be used towards the
conclusion of your chest or triceps workout.