How many springs should I use?

One medium spring is the usual setting, and the light load is deliberate, because the point is to hold an upright torso while the arms work. Adding springs mainly makes it harder to stay stacked over your knees, so add tempo, range or the head turns before you add load.

Why is the breath held and the head turned at the back of the movement?

In the classical version you inhale as the arms press back, hold the breath with the chest open and turn the head left, center and right before the arms return. It adds a neck stretch and tests whether the torso can stay still while the head moves. Keep the hold brief, and skip the turns if your neck is sensitive.

How is this different from Arm Circles on the reformer?

Chest Expansion follows one straight path into shoulder extension and pauses there, so the shoulder extensors stay loaded for the whole rep. Pilates Reformer Arm Circles take the arms through a circle from the same kneeling position, covering more of the shoulder's range and spreading the work around the joint.

Pilates Reformer Chest Expansion

What Is the Pilates Reformer Chest Expansion?

Pilates Reformer Chest Expansion is an isolation exercise that primarily targets the back and also engages the shoulders, triceps and core. It is an intermediate-level movement performed kneeling upright on the reformer carriage facing the risers, with a strap in each hand. The elbows stay straight while the arms press back past the hips, and the resistance comes from the springs through the ropes rather than from any added weight.

The name describes what the chest does, not the muscle that works. As the arms travel back the chest opens and the classical version holds a deep inhale there, so the pectorals are being lengthened rather than loaded. The muscles doing the pulling are the latissimus dorsi, the teres major and the back of the shoulder, which is why this belongs with back work rather than with pressing work. A trainer looking for the nearest gym equivalent should think of Cable Straight Arm Pulldown, not a chest press.

Chest Expansion sits in the classical kneeling arm work series on the reformer, usually after the supine footwork and arm work and alongside Pilates Reformer Arm Circles. What it adds is shoulder extension and an upright torso at the same time, since kneeling on a carriage that can slide turns a simple arm pull into a front-to-back balance task for the hips and abdominals. A study of 26 Pilates-trained men doing reformer arm work with the straps compared four arm angles and found the arms-by-the-sides pull used here produced the least upper trapezius activity of the four, which fits how the exercise is used with clients who feel every arm exercise in their neck.

Position changes this exercise more than spring load does. One medium spring is the usual setting, and adding springs mostly makes staying stacked over the knees harder rather than making the back work harder. Turning the head left, center and right on the held breath adds a neck stretch and a check on whether the torso can stay still, and hooking the feet over the back edge of the carriage takes away the anchor of the shins and widens the balance demand.

It suits clients who sit for a living and round forward at the shoulders, and it gives trainers a low-load way to train shoulder extension without a cable stack. If tall kneeling is unsteady at first, make the same arm pull sitting on a Pilates box and add the kneeling version once the torso stays quiet. The cue worth keeping is to grow taller as the arms travel back, because the moment the ribs push forward the lower back starts doing what the shoulders should be doing.

Muscles Worked

MuscleActivation

Latissimus Dorsi: Primary
Deltoid: High
Teres Major: High
Lower Trapezius: Medium
Rhomboid Major: Medium
Triceps Brachii (Long Head): Medium
Erector Spinae: Low
Gluteus Maximus: Low
Rectus Abdominis: Low
Infraspinatus: Minimal

Instructions

Set a light to moderate spring load, usually one medium spring, and check that the ropes are long enough for the handles to reach the carriage.
Kneel upright in the middle of the carriage facing the risers, with your knees against the shoulder blocks and the tops of your feet resting on the carriage behind you.
Take a handle in each hand with your palms facing in, and let your arms hang straight just in front of your thighs with light tension already on the ropes.
Stack your head over your shoulders and your shoulders over your hips, draw your ribs down and lengthen the back of your neck.
Inhale and press both arms straight back past your hips, keeping your elbows straight and your shoulders wide and low.
Stop where you can hold the position with your torso upright and your ribs down, rather than pulling the arms further back than that allows.
Hold for a moment with the chest open. In the classical version, keep the breath in and turn your head left, back to center, right, and back to center.
Exhale and bring your arms forward under control until the handles are back in front of your thighs, letting the carriage settle rather than snap.
Grow tall again and start the next rep, keeping your hips over your knees so the carriage only travels as far as your arms do.

Common Mistakes

Sitting back toward the heels
Letting the hips drift behind the knees as the arms press back, so the spring tension pulls the body out of its vertical stack.
Rib cage popping forward
Pushing the ribs and sternum forward so the lower back arches instead of the shoulders extending.
Rolling the shoulders forward
Letting the shoulders round and the upper arms turn inward as the arms travel back, which closes the chest the movement is meant to open.
Poking the chin forward
Pushing the head forward and shortening the back of the neck rather than keeping the head stacked over the shoulders.
Chasing range
Dragging the arms further back than the shoulders allow, so the torso tips forward to make up the difference.
Letting the springs pull the arms home
Releasing the return so the springs snap the carriage back instead of bringing the arms forward under control.

Injuries

Pilates Reformer Chest Expansion is a low risk exercise when performed with proper technique. The spring load is light, the elbows stay straight so there is nothing to press or catch, and the arms cover a short range. Three places take strain when technique slips: the front of the shoulder, when the arms are dragged further back than the joint will travel; the lower back, when the ribs push forward and the lumbar spine arches instead of the shoulders extending; and the knees, which carry body weight on the carriage for the whole set.

Keep the shoulders wide and the upper arms turned slightly outward as the arms go back, so the head of the shoulder does not roll forward at the end of the range. Stop the pull where your ribs can stay down, and treat that as the range rather than chasing a few more inches. Pad the knees with a folded towel or mat if the carriage feels firm, and leave kneeling out altogether if you have had a knee replacement or have been told to avoid deep knee bend. The classical head turns happen on a held inhale, so keep that hold brief and simply breathe through the movement if you have high blood pressure or get lightheaded.

If tall kneeling is uncomfortable or unsteady, make the same arm pull sitting on a Pilates box, cross-legged or with the legs extended, which keeps the shoulder work and removes the knee position. To progress, slow the return, add the head turns, hook the feet over the back edge of the carriage, or add a spring once the torso stays still throughout. Pilates Reformer Arm Circles work the same tall kneeling position through a wider arc and are a useful companion when shoulder extension is limited.

Stop the set if you feel pinching at the front of the shoulder, a sharp line across the lower back, or knee pain that does not settle once you add padding. Anyone with a shoulder injury or a restriction on shoulder extension should have this cleared before adding spring load, and anyone with a neck problem should leave the head turns out.

Overview

Primary Focus: Back
Equipment: Pilates reformer
Modality: Strength
Difficulty: Intermediate

Alternative Exercises

Frequently Asked Questions

Q: Does Chest Expansion actually work the chest?: Not as the working muscle. The name comes from the chest opening and the deep breath taken with the arms held back, while the muscles doing the pulling are the latissimus dorsi, the teres major and the back of the shoulder. Treat it as back work that stretches the chest, not as a substitute for pressing.
Q: How many springs should I use?: One medium spring is the usual setting, and the light load is deliberate, because the point is to hold an upright torso while the arms work. Adding springs mainly makes it harder to stay stacked over your knees, so add tempo, range or the head turns before you add load.
Q: Why is the breath held and the head turned at the back of the movement?: In the classical version you inhale as the arms press back, hold the breath with the chest open and turn the head left, center and right before the arms return. It adds a neck stretch and tests whether the torso can stay still while the head moves. Keep the hold brief, and skip the turns if your neck is sensitive.
Q: What can I do if kneeling hurts my knees?: Pad the knees with a folded towel or mat first, which is enough for most people. If it is not, do the same arm pull sitting on a Pilates box, cross-legged or with the legs extended, and you keep all of the shoulder work without the knee position.
Q: How is this different from Arm Circles on the reformer?: Chest Expansion follows one straight path into shoulder extension and pauses there, so the shoulder extensors stay loaded for the whole rep. Pilates Reformer Arm Circles take the arms through a circle from the same kneeling position, covering more of the shoulder's range and spreading the work around the joint.