Highest-scoring exercise in the entire 1,619-exercise database. Lying on the floor eliminates all momentum and body sway. The 20:1 mechanical disadvantage of the deltoid lever means 5 kg creates approximately 1,000 N of deltoid tension. Full isolation with no trap or body compensation.
Score 86/S — highest in database — no other exercise delivers as much targetable muscle tension per kilogram of external load.
20:1 lever ratio — the deltoid inserts ~1.5 cm from the shoulder joint; the hand is ~30 cm away. This is the worst mechanical disadvantage of any muscle, which paradoxically maximizes internal tension.
Floor eliminates momentum — lying supine removes every compensation pattern available when standing or seated.
Placed first because this S-tier exercise demands completely fresh muscles for maximum benefit.