The last thing you want to hear mid-cramp is "have you tried yoga." We know. But the research on movement and period pain is better than the research on most of what's in your bathroom cabinet, and the useful version takes five minutes on your bedroom floor. Here's what has been tested, then the routine.
Do stretches for period cramps actually help?
A 2019 Cochrane review pulled together 12 trials with 854 women. Exercise, whether low-intensity like stretching, core work and yoga, or high-intensity like aerobics, went with a large drop in period pain compared with doing nothing: about 25 mm on a 100 mm pain scale, which the authors call clinically significant. The catch is in the details. The trials mostly had women exercise 45 to 60 minutes, three times a week, all month long, and some asked them not to exercise during the period itself. The evidence is rated low quality, and it's unclear whether it holds after age 25.
So the honest reading is: regular movement across the month is what the data supports. A five-minute stretch on day one is the emergency version, and it rests on smaller trials plus the fact that it costs nothing to try.
The smaller trial worth knowing: in 2011, 92 students aged 18 to 22 were split in two; one group did three yoga poses (cobra, cat and fish) in the second half of their cycle, the other did nothing. Over three cycles the yoga group's pain intensity and pain duration both fell compared with the control group. Three poses. That's the backbone of the routine below.
Why movement touches cramps
Two plausible reasons. Exercise releases endorphins, your own painkillers, which is why ACOG describes aerobic activity as producing "chemicals that block pain." And gentle stretching brings blood to the lower back and pelvis, where the cramping muscle is, the same logic as a heating pad. Neither has been proven as the mechanism. Both are reasonable, and the NHS lists gentle exercise like yoga among its period pain self-care.
5-minute stretches for period cramps, no mat needed
Do these on a bed, a rug or a folded blanket. Move slowly, breathe out into the stretch, and stop anything that sharpens the pain. About a minute each.
1. Cat and cow. On hands and knees. Breathe in and let your belly drop while your tailbone lifts; breathe out and round your spine toward the ceiling. Slow, six to eight rounds. This is the "cat" from the 2011 trial, and it's the one to start with because it moves the lower back without asking anything of your abdomen.
2. Child's pose with wide knees. From hands and knees, take your knees wide, sit back toward your heels, and rest your forehead on the bed or your stacked hands. Let your belly hang between your thighs. If your hips are tight, put a pillow under your chest. Breathe into your lower back.
3. Cobra, the gentle kind. Lie on your front, hands under your shoulders, and press up only as far as your lower back is happy, elbows bent. Look forward, not up. This is the second trial pose. If it pulls, go lower; the point is a slow opening across the front of the belly, not a backbend.
4. Reclined twist, 30 seconds a side. On your back, hug your knees in, then let both drop to one side with your arms out. Shoulders stay down. Cramps often sit in the lower back as much as the front, and this is the one that reaches it.
5. Fish, the easy version. The 2011 trial used fish pose, a chest lift propped on the elbows. Our no-strain version: lie on your back with a rolled towel or small pillow under your shoulder blades, arms loose, and let your chest open. Breathe. Stay a minute. Done.
When to do them
The trial dosed yoga in the luteal phase, the two weeks before bleeding, not only on the day. If you can, run the five minutes each evening from about a week before your period, then keep going through day two. On the day itself, do them with a heating pad afterward; our comparison of heating pads, hot water bottles and patches explains why the two stack. If you're stuck at a desk, the twist and a seated forward fold both work in a chair, and there's more in our piece on period cramps at school.
What did not work for us
Deep abdominal work on day one. One of us tried a plank-and-crunch "core for cramps" routine from a video and it made the cramp sharper, not softer, for about an hour. The trials that included core strengthening did it across the month, not mid-cramp. On the bad day, keep to the gentle five above.
What we make, for the record: Girl Chocolate is a dark chocolate bar for the days around your period, sold as a pouch of 8 bars for one cycle, with magnesium and other functional ingredients. It supports PMS relief* and it's the thing we reach for after the stretch, not instead of it. Movement has the stronger evidence here; the bar is the reward. See it here.
Print our free period cramp relief cheat sheet: the heat, ginger, magnesium and timing facts from this guide, all on one page. 1 page, PDF, no email needed.
Download the PDFSources
- Armour 2019, exercise for dysmenorrhoea (Cochrane)
- Rakhshaee 2011, three yoga poses for primary dysmenorrhea (J Pediatr Adolesc Gynecol)
- ACOG, Dysmenorrhea: painful periods
- NHS, Period pain
When to talk to a doctor
Stretching is for ordinary cramps. See a doctor if you have any of these:
- Pain that stops you doing daily life, even with painkillers
- Bleeding through a pad or tampon every hour
- Pain that suddenly got much worse, or changed its pattern
- Pain with a fever
* These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
