Machine Triceps Dips

Grip the bars with your palms facing one another. Then, kneel on the padded support base of the machine at the same time you straighten your arms and raise your torso.  
 
Lean your torso forward and pull your chin to your chest.
 
Lower your body down as far as possible between the bars, being sure to maintain the angle of your torso and your elbows moving out to the sides. 
 
Press your body up to the starting position; do not lock your elbows at the top.