Sit on a bench with your back straight 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 by contracting your triceps. Keep your core tight and avoid flaring your elbows throughout the movement.
Log your dumbbells seated triceps extension sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.