Lie flat on a bench holding a barbell with a close grip (hands slightly inside shoulder width). Extend your arms straight above your chest, then bend only at the elbows to lower the bar behind your head in a controlled arc. Keep your upper arms stationary and elbows close, then extend back up by contracting your triceps. Maintain control throughout the movement.
Log your barbell lying close grip triceps extension sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.