Chin-Up (Sternum) - Pull-Up Bar

Grip pull-up bar underhand, shoulder-width.

Hang arms extended.

Lean back significantly (~30 degrees), arch lower back, chest out.

Pull body up towards bar, maintaining backward lean.

Aim to touch sternum (breastbone) to bar.

Keep head tilted back.

Squeeze back muscles.

Lower slowly back to start.

Repeat.