· By Amy Suzanne Upchurch, Founder + CEO of Pink Stork, Certified Health Coach, INHC
Does cycle syncing your workouts actually work?
The research is more mixed than the trend suggests. A 2023 umbrella review of meta-analyses and systematic reviews found no consistent influence of menstrual cycle phase on acute strength performance or long-term resistance training adaptations.† Other meta-analyses have found small effects in specific measures, like early-follicular strength, but the overall evidence base is inconsistent, not a proven performance formula.
Note: for the fuller picture on general cycle-syncing lifestyle claims beyond training, see our related guide, what is cycle syncing, and does it work?
The cycle-syncing workout trend, explained
The popular version of cycle syncing tells you to train heavy in your follicular phase, when estrogen is rising, and go gentle in your luteal phase, when progesterone dominates. It is a tidy, appealing framework. The trouble is that a tidy framework and a well-supported one are not always the same thing.
What the research actually shows (it's more mixed than the trend suggests)
A 2023 umbrella review of meta-analyses and systematic reviews concluded that current evidence shows no consistent influence of menstrual cycle phase on acute strength performance or on long-term adaptations to resistance training.1 A separate systematic review and meta-analysis found the early follicular phase was associated with a trivially reduced level of exercise performance compared with other phases.2 Another meta-analysis specifically on maximal isometric strength found small-to-medium reductions in the early follicular phase compared to later phases.3 Taken together: the effect sizes are small and inconsistent across studies, which is a meaningfully different claim than "you should structure your whole training week around your cycle."
"Don't just buy just to consume because you saw it somewhere. Truly figure out what it is specifically that you're battling, what it is that you need, what your lab work is saying, and then fill in the gaps from there."
— Dominique Landry, Founder of Fit Enough
What does have more consistent support
Cycle-phase changes in thermoregulation and sleep have more consistent research support than strength-performance claims do.1 That's a real, separate finding worth knowing, even if it isn't the headline most cycle-syncing content leads with.
Supporting the hormone side of the equation
If cycle regularity and hormone signaling are part of what you're paying attention to as you train, Myo Chiro 40:1, formulated to support cycle regularity, uses a clinically studied 40:1 ratio of Myo-Inositol to D-Chiro-Inositol to support hormonal wellness and ovarian health.† For the stress-and-recovery side of a demanding training week, our stress support formula for women is designed to support a healthy stress response.† Myo Chiro 40:1 is not for use during pregnancy, and provider consultation is recommended for breastfeeding use.
"Every trend on your feed wants you to believe there's one right way to move your body. I've learned that consistency, grace, and listening to what your own body needs will always outlast a formula."
— Amy Suzanne Upchurch, Founder and CEO of Pink Stork
A more realistic way to use your cycle as training information
- Track how you personally feel across your cycle rather than assuming a universal pattern applies to you.
- Prioritize consistent training over rigid phase-based programming.
- Pay attention to sleep and thermoregulation shifts, where the evidence is stronger.
- Treat cycle-based training as a personal experiment, not a proven hack.
Frequently asked questions
Does the menstrual cycle affect strength performance?
The overall evidence is inconsistent. A 2023 umbrella review found no consistent influence of cycle phase on acute strength performance or long-term adaptations.1
Is there any phase where performance is measurably different?
Some meta-analyses found small, trivial-to-modest reductions in performance or strength during the early follicular phase specifically, but findings are not uniform across studies.2,3
Should I stop training heavy during my luteal phase?
The research doesn't support a blanket rule like this. Structuring training around your cycle can be a reasonable personal experiment, not a scientifically mandated approach.
What cycle-related effects does the research support more consistently?
Changes in thermoregulation and sleep across cycle phases have more consistent research support than strength-performance claims.1
Is cycle syncing a proven performance hack?
No. It's a reasonable framework to experiment with personally, but the current evidence base is small and inconsistent, not a proven method.
Can Myo Chiro 40:1 improve my athletic performance directly?
Myo Chiro 40:1 is formulated to support hormonal wellness, ovarian health, and cycle regularity, not athletic performance directly.†
† 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. Always consult your healthcare provider before starting any new supplement, especially during pregnancy, breastfeeding, or while managing a medical condition. Keep out of reach of children.
Sources: 1 "Current evidence shows no influence of women's menstrual cycle phase on acute strength performance or adaptations to resistance exercise training," Frontiers in Sports and Active Living, 2023. 2 "The Effects of Menstrual Cycle Phase on Exercise Performance in Eumenorrheic Women: A Systematic Review and Meta-Analysis". 3 "The Influence of Menstrual Cycle Phases on Maximal Strength Performance in Healthy Female Adults," PMC. 4 Cleveland Clinic: Menstrual Cycle Overview.
