Pilates
Reformer Short Box Flat Back
Reformer Short Box Flat Back is a seated backward hinge that trains abdominal control while you keep your spine steady. You lean from the hips and return upright without rounding your back.
Higher injury risk. Read the safety notes before adding weight.
- Intermediate
- Isolation
- Higher injury risk
- Rest 45 sec
How to do it
- Place the box crosswise on the carriage in the manufacturer's short-box position.
- Sit tall on the box facing the footbar, with your hips fully supported.
- Position your feet hip-width apart under the safety strap, with your knees slightly bent.
- Reach your arms overhead alongside your ears.
- Hinge your torso backward from your hips, keeping the natural curves of your spine unchanged.
- Return your torso to upright through the same path.
Form cues
- Keep your ribs stacked over your pelvis.
- Keep tension against the foot strap.
- Reach long through your fingertips.
- Exhale as you return upright.
Common mistakes
- Tucking the pelvisKeep your weight on your sitting bones rather than rolling toward your tailbone.
- Leaning too farShorten the hinge to a range where your lower back does not arch.
- Swinging the arms to returnKeep your arms fixed relative to your torso so momentum does not pull you upright.
Safety
A loose foot strap or shifting box can let you fall backward off the reformer. Fatigue or an excessive hinge can also strain your lower back.
- Use the manufacturer's recommended spring setting to keep the carriage stationary.
- Check that the box cannot slide and the safety strap and its anchors are secure before sitting.
- Keep the area behind the reformer clear.
- End the set when you can no longer reverse the hinge smoothly.
If you have back or hip pain, or cannot sit securely with your feet under the strap, get advice from a physiotherapist before attempting this exercise.
Muscles worked
Primary muscles
Secondary muscles
Equipment
- Pilates Reformer
- Pilates Sitting Box
Sets and reps
- Sets
- 1–2
- Target
- 5–8 reps
- Rest
- 45 sec
Start with your arms crossed over your chest if the overhead position makes the hinge difficult to control.