For a long time, women were taught to push through workouts the same way every day of the month. But in recent years, scientists and sports researchers have begun looking more closely at something many women have quietly noticed for years: some days workouts feel powerful and easy, and other days they feel harder than usual.
It turns out this isn’t just in your head.
Your menstrual cycle influences hormones that affect energy levels, strength, metabolism, and even how your body recovers after exercise. Understanding these natural shifts can help you work with your body instead of against it.
Why Your Cycle Can Affect Your Workouts
Hormones act as messengers in the body, influencing everything from mood to metabolism. Throughout the menstrual cycle, levels of estrogen and progesterone rise and fall in predictable patterns. These hormonal shifts can influence things like strength, endurance, flexibility, recovery, and perceived effort during exercise. Research has shown that physical performance can vary slightly depending on where someone is in their cycle.
The changes are usually small, but they can be noticeable. Some days you may feel strong and energized, while other days your body may benefit from slightly gentler movement. Rather than forcing your body into the same routine every day, it can be helpful to adjust your workouts to match how your body feels during each phase.
The Four Phases of the Menstrual Cycle and How to Adjust Your Workout Accordingly
Menstrual Phase: Days 1-5
The menstrual phase begins on the first day of your period and usually lasts a few days. Hormone levels are at their lowest during this time. For some women, this phase can bring fatigue, cramps, or lower energy levels. Research suggests strength performance may be slightly reduced for some people during this stage, although the difference is typically small. This can be a good time to focus on gentle movement and recovery-based workouts, such as:
- Light Pilates or low-impact barre
- Mobility work and stretching
- Walking
- Restorative yoga
However, if you feel energized, moderate exercise is still perfectly safe and may even help reduce menstrual discomfort and improve mood.
Follicular Phase: Days 6-14
After your period ends, estrogen begins to rise. This phase often brings a gradual increase in energy, motivation and improved mood. Many women notice they feel stronger and more capable of challenging workouts during this part of their cycle. This phase is often ideal for:
- Strength training
- Challenging barre classes
- Pilates with heavier resistance
- Interval training
- Trying new or more demanding workouts
For barre and Pilates girls, this might be when deeper muscle work, longer holds, and higher-energy classes feel especially rewarding.
Ovulatory Phase: Around Days 14-16
Around the middle of the cycle, estrogen reaches its peak during ovulation. Some research suggests this phase may be associated with slightly higher strength and power output. Due to the rise in estrogen, an increase in flexibility is often found during this time, which can be especially beneficial for movements in barre and Pilates. However, this shift in ligament elasticity can also increase the risk of certain injuries. It’s especially important to be mindful of alignment and control during movements at this time in your cycle. Overall, women report feeling confident, strong, and energized during ovulation, making it a great time for:
- High-intensity workouts
- Strength training
- Advanced barre classes
- Power-focused training
- Performance-focused workouts
Luteal Phase: Days 17-28
After ovulation, progesterone rises and the body begins preparing for a possible pregnancy. During this phase, several subtle changes occur. Body temperature increases slightly, which can make endurance workouts feel more demanding. The body may also shift toward burning more fat for fuel rather than carbohydrates. Some women feel steady and focused during this phase, while others experience fatigue or lower motivation as the cycle progresses.
This can be a great time for movement that supports strength, stability, and endurance without pushing to maximum intensity. During this phase, many women feel best focusing on:
- Steady-state workouts
- Moderate strength training
- Lower-impact barre classes
- Pilates for core stability
- Walking or low-intensity cardio
As the cycle approaches menstruation, prioritizing recovery, hydration, and sleep can be especially helpful.
Your Body Is Unique
While science supports the idea that the menstrual cycle can influence exercise performance, the differences are usually modest. Studies often show changes of around 3-5% in performance between phases. That means the most important factor is still listening to your own body.
Some women feel dramatic shifts in energy throughout the month, while others notice very little change. Hormonal birth control, stress levels, sleep quality, and nutrition can also influence how your body responds. Cycle syncing isn’t about rigid rules. It’s simply another tool that can help you understand your body a little better. Do what feels good for you.
Lets Work With Our Bodies
Your body moves through natural rhythms every month, and your workouts can move with those rhythms too. Some days may feel powerful and energetic while others may call for slower, more restorative movement. Both deserve a place at your table. We don’t need to constantly be pushing ourselves through our routine workouts. On those days where you feel weak, or just not into your workout, have a little grace with yourself. Our bodies are constantly undergoing massive, hormonal changes each month and our workouts should be able to change and adapt with us too.
At the end of the day, the most important thing is consistency. Moving your body regularly, building strength, and supporting your overall health will always matter more than perfectly timing every workout. When you learn to work with your body instead of fighting it, exercise can feel more sustainable, more enjoyable, and ultimately more effective.
Sources:
McNulty KL et al. The Effects of Menstrual Cycle Phase on Exercise Performance in Eumenorrheic Women: A Systematic Review and Meta-Analysis. Sports Medicine.
https://link.springer.com/article/10.1007/s40279-020-01319-3
Bruinvels G et al. Prevalence and frequency of menstrual cycle symptoms are associated with availability to train and compete. British Journal of Sports Medicine.
https://bjsm.bmj.com/content/55/8/438
Fehring RJ et al. Physiology, Menstrual Cycle. StatPearls Publishing.
https://www.ncbi.nlm.nih.gov/books/NBK500020/
