This triceps exercise can require considerable strength when the assist is not used. It also works the pectoral muscles of the chest to some degree. 

1 Place a hand on each handle, keeping your hands in line with your elbows and shoulders. Slowly place first one and then the other knee onto the kneepad. 

2 Lower your body weight gently onto the kneepad, keeping your shoulder, elbows, hips, and knees in line. 

3 Inhale as the kneepad lowers and push your elbows out behind you. Lower yourself down to a comfortable position, but aim to have an angle at 90 degrees at each elbow. 

4 When you have reached the position, exhale and slowly push yourself back up the start position.