dumbbell lying one arm supinated triceps extension

How to do this exercise

1. Step:1 Lie flat on a bench with your back and head supported, and your feet flat on the ground.
2. Step:2 Hold a dumbbell in one hand with an underhand grip, and extend your arm straight up above your shoulder.
3. Step:3 Keeping your upper arm stationary, slowly lower the dumbbell behind your head by bending your elbow.
4. Step:4 Pause for a moment at the bottom, then extend your arm back up to the starting position.
5. Step:5 Repeat for the desired number of repetitions, then switch arms.