Stand with feet shoulder-width apart and hold a dumbbell with both hands. Lift it overhead until your arms are fully extended. Keep your elbows close to your head and slowly bend them to lower the dumbbell behind your head in a controlled motion. Pause briefly at the bottom, then extend your arms back up to the starting position, squeezing your triceps at the top. Keep your core tight and avoid flaring your elbows.
Log your dumbbell standing triceps extension sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.