1. Jump up and grab the bar with your hands shoulder-width apart. The palms facing away from you.
  2. Hang with your arms fully extended. You can bend your legs at the knee if they touch the ground.
  3. Keep your shoulders back and your core muscles tight throughout the exercise.
  4. Then pull up.
  5. Pull yourself slowly up until your chin is over the bar, and then slowly downwards until your arms are extended again.
  6. Repeat.