how to use Gym DOOR
Exercise: Crunch with the Gym Door
Working on your abdominal muscles
3 series of 15 reps. Rest for 1 minute between each series.
Breathe in when extended and breathe out on the way up.
SAFETY INSTRUCTIONS AND TECHNIQUE
Try not to move your neck. Keep your shoulders away from your ears. The lower part of your back must always touch the ground. Your legs must be folded and relaxed.