Reformer Pilates
Illustration of Book Opening Stretch on the Pilates reformer

Exercise

Book Opening Stretch

Beginner

Side-lying thoracic rotation stretch that opens the chest and upper back.

Setup instructions

Lie on your side with knees bent and arms reaching forward, palms together. Keep the hips stacked and the knees aligned. Use a pillow under the head if needed.

Breathing cues

Inhale to open. Exhale to return.

Movement steps

  1. 1Inhale to open the top arm toward the ceiling and behind you.
  2. 2Follow the hand with the gaze if the neck is comfortable.
  3. 3Exhale to return the arm to the start.
  4. 4Repeat and switch sides.

Common mistakes

Letting the knees lift and separate; forcing the arm to the floor; twisting the lumbar spine; holding the breath.

Safety notes

Keep the rotation in the upper back. Stop if shoulder or neck pain appears.

Connections

Muscles worked

Equipment needed

FAQs

  • Is Book Opening Stretch beginner-friendly?

    Yes. It is a gentle, accessible rotation stretch for most beginners.

  • What muscles does Book Opening Stretch work?

    Thoracic rotators and chest muscles lengthen; core keeps the pelvis stable.

  • What is Book Opening Stretch good for?

    It improves upper-back rotation and counteracts forward posture.

  • Should my arm touch the floor behind me?

    Only open as far as the knees stay together and the rotation feels good in the upper back.