The doorway pec stretch opens up the chest by stretching the pec muscles. This stretch can help reduce forward, rounded shoulders and hunched back postures that can develop over time. Lengthening the pec muscles allows for improved shoulder and neck mobility.
Stand in an open doorway. Place your forearms on either side of the door frame at shoulder height or slightly lower.
Lean your trunk and chest forward through the doorway until you feel a stretch in the front of your chest and shoulders. As you hold this stretch, try to keep your shoulder blades away from your ears.