Double Leg Stretch: A Complete Guide
Quick Intro
Double Leg Stretch is a mat Pilates exercise performed curled up with the knees hugged to the chest, inhaling to simultaneously extend both legs and sweep the arms overhead, then exhaling to circle the arms back and hug the knees back in. The moment of full extension, legs low and arms back, is the peak of the exercise, the point where the abdominal lever arm is longest and the work is hardest.
Equipment Needed
No equipment is required. A Yoga Mat underneath is an optional way to take the edge off a hard floor under the shoulders.
Why It Matters
Extending fully and pulling back in rep after rep takes staying power in the abdominals, reaching the arms and legs away from each other asks for range and matching the breath to the extension and the pull-in takes timing. The abdominal muscles running down the front of the stomach (rectus abdominis) hold the curled-up position through every rep, and a deep core muscle that wraps around the torso like a corset (transverse abdominis) keeps the lower back from arching at the point of full extension. The deep hip flexor (hip flexors, iliopsoas) drives the legs out and back, a muscle along the side of the ribcage (serratus anterior) helps stabilize the shoulder blades as the arms sweep overhead and a muscle at the back of the thigh (hamstrings, biceps femoris) lengthens as the legs extend low.
When to Do It
Double Leg Stretch works well in the supine abdominal portion of a Pilates mat session, usually placed among the other extending and pulling-in exercises. Two to three sessions a week is a reasonable pace for building this coordinated reach.
Anyone with a current lower back issue should get individual guidance before adding this exercise, since the moment of full extension makes it hard to keep the lower back from arching off the mat.
Getting Ready
A few small pulses of the knees hugging in, without the full extension yet, warm up the abdominals before the reach is added. Extending the legs to a higher, easier angle for a few reps previews the coordination the fuller version demands.
Step-by-Step Instructions
1. The setup. Curl up with the knees hugged into the chest, hands resting lightly on the shins.
2. The extension. Inhale and simultaneously extend both legs low and sweep the arms overhead.
3. The peak. Pause briefly at full extension, keeping the lower back pressed into the mat.
4. The pull-in. Exhale and circle the arms back around to hug the knees back into the chest.
How Many, How Often
Double Leg Stretch is dosed by reps, with each extend-and-pull-in counting as one.
| Level | Where you’re at | What to do |
|---|---|---|
| Beginner | New to keeping the back flat at full extension | 2 sets of 5 to 6 reps, with the legs extended higher |
| Intermediate | The lower back stays flat through a lower extension | 2 to 3 sets of 6 to 8 reps |
| Advanced | Comfortable with a full low extension and no arch | 3 sets of 8 to 10 reps |
The lower back staying pressed into the mat at the point of full extension matters more here than how low the legs reach, since a lower leg position that comes with an arching back trades control for the appearance of a bigger stretch.
Modifications and Variations
As an easier version, Double Leg Stretch — Legs at 90 extends the legs only to 90 degrees, not low toward the floor, reducing the load on the lower back while the coordinated reach is still being learned.
As a harder version, Double Leg Stretch — Extended Low lowers the legs even further than the standard version, asking the deep core to hold the imprint (the lower back pressed flat into the mat) through a longer lever.
Common Mistakes to Avoid
Letting the lower back arch at full extension. Allowing the back to lift off the mat right as the arms and legs reach their furthest point removes the deep core control this exercise is meant to build. Keeping the lower back down, even if that means the legs stay a little higher, keeps the work in the deep core.
Rushing through the extension without a clear peak. Snapping the arms and legs out and immediately pulling them back skips the brief pause that lets the position be felt and controlled. A clear moment at full extension, even a short one, makes the whole rep count more.
Letting the arms lead while the legs lag behind, or the reverse. Extending one half of the body noticeably before the other breaks the simultaneous reach this exercise depends on. Both the arms and legs should move outward and pull back in together, on the same timing.
After Your Set
Hugging both knees into the chest and rocking gently from side to side releases the lower back after a set built around repeated full extensions. A standing or seated hamstring stretch on each leg eases out the muscles that reached low on every rep.
Going Deeper
This exercise usually works well as a test of deep core control under a long lever, since extending the arms and legs fully away from each other, then reversing that reach, asks the abdominals to resist an arch at the point where the load is greatest. A lower leg position looks more impressive even when the lower back has started to arch to allow it. Keeping the legs a bit higher with a flat back, even if the range looks smaller, builds strength faster than chasing a lower reach with an arched spine.
Someone new to this exercise generally manages a higher extension with a flat back within a few sessions, then works toward a fuller, lower reach over two to three weeks.
How to Know You’re Improving
- A lower back that stays flat against the mat through every full extension
- A clear, brief pause at the peak of the reach
- Arms and legs that extend and pull in on the same timing
- An extension that lowers gradually while the flat back stays consistent
A lower back that never arches at full extension matters more than how low the legs reach.
Muscles Worked
- Rectus Abdominis (the abdominal muscles running down the front of the stomach, holding the curled-up position through every rep)
- Transverse Abdominis (a deep core muscle that wraps around the torso like a corset, keeping the lower back from arching at full extension)
- Iliopsoas (the deep hip flexor, driving the legs out and back)
- Serratus Anterior (a muscle along the side of the ribcage, stabilizing the shoulder blades as the arms sweep overhead)
- Biceps Femoris (a muscle at the back of the thigh, lengthening as both legs extend low)
FAQ
Why does the exercise say to keep the legs higher if the back starts to arch? Because the lower back staying flat is what keeps the deep core doing the work this exercise is meant to build. A lower leg position that comes at the cost of an arching spine shifts the load somewhere it shouldn’t go.
Is it normal for the arms and legs to feel out of sync at first? Yes, some difficulty timing the arms and legs to extend and pull in together is a common early experience. Slowing the whole movement down tends to make that coordination click faster than trying to speed through it.
Is some deep ab fatigue after this exercise normal? Yes, fatigue through the deep abdominals after several full extensions is expected. Sharp pain anywhere in the lower back is a different matter, one worth easing off for and raising with a doctor or physical therapist if it continues.
Is a higher leg position acceptable if the full low extension feels like too much? Yes, keeping the legs higher is a reasonable way to protect the lower back while the pattern develops, and Double Leg Stretch — Legs at 90 is built that way.
How often should Double Leg Stretch be practiced? Two to three times a week, as part of the supine abdominal portion of a broader mat session, is enough repetition to build this coordinated reach.
Related to Double Leg Stretch — Legs at 90 as the easier version with the legs extending only to 90 degrees and Double Leg Stretch — Extended Low as the harder version with an even lower leg extension.