Stand with feet shoulder-width apart and hold a dumbbell in each hand. Bend your knees slightly and hinge forward at the hips while keeping your back straight. Bring your upper arms close to your torso so your elbows are bent at about 90 degrees. Keeping your upper arms fixed in place, extend both arms backward until they are fully straightened, squeezing your triceps at the top. Slowly return to the starting position with control and repeat.
Log your dumbbell standing bent over two arm triceps extension sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.