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If you regularly exercise, you’ve likely had your period show up right before an important or more intense workout. When it happens, it’s more than just annoying. It can also negatively impact your motivation, energy, and performance.

Despite it seeming like a game of chance, there is a way to start cycle syncing exercise in order to take advantage of the hormonal shifts in your body. It’s called cycle syncing, and I can tell you from person experience—IT WORKS!

When it comes down to it, the menstrual cycle is simply a series of hormonal shifts, and those shifts can be used to your advantage, specifically when it comes to the workouts you do in each phase of your menstrual cycle. In fact, cycle syncing other aspects of your life, including cycle syncing food and cycle syncing skin care can also have a positive impact on your health. Long term, it’s an incredible way to balance hormones naturally.

When implemented properly, cycle syncing exercise to your menstrual cycle can make it easier to stick with a training plan, decrease recovery time, and as a result—improve how you look, feel, and perform. It also means not fighting your body or working against it, which as a general principle is a way more enjoyable way to live.

Before we dive into cycle syncing exercise, let’s first review the phases of the menstrual cycle, and what’s happening in your body during each phase.

The Phases of The Menstrual Cycle

In general, the menstrual cycle occurs in two phases. The first phase, which starts the first day you get your period and lasts until the day you ovulate, is called the follicular phase. During this phase, estrogen increases in order to stimulate follicle growth (hence the name, follicular. Thank you, science).

The second phase is called the luteal phase. This phase starts the day after you ovulate, and goes until the day you start your period. During this phase, progesterone increases (as does your body temperature), estrogen increases slightly, and both taper off in the event the egg isn’t fertilized to start the cycle over again.

Breaking it down even further (which becomes important when talking about how to train with your menstrual cycle), the first 5 days of the follicular phase are known as the menstrual phase when the uterus sheds its inner lining. In between the follicular phase and the luteal phase is the ovulation phase, which is the day the ovary releases a mature egg cell. For more in-depth explanation of the phases of each cycle, check out my Beginner’s Guide to Cycle Syncing: How to Adapt Your Food and Fitness to Your Menstrual Cycle.

Figuring Out the Length of Your Menstrual Cycle

Most conventional establishments break down the phases of the menstrual cycle according to the day(s) they occur; however, this can be incredibly inaccurate as the menstrual cycle can last anywhere from 23-36 days. While the average cycle length is 28 days, most women will vary from this. But, you do need to know what phase you’re in in order to start cycle syncing exercise.

In order to figure out the length of your cycle and when each phase occurs, there are a few simple things you can track on your own. As outlined in Taking Charge Of Your Fertility, once ovulation occurs, you experience a significant rise in your Basal Body Temperature (BBT). This rise is typically 0.4 degrees Fahrenheit, and the temperature shift is sustained until progesterone begins to drop off and menstruation starts over again. The day just before this temperature shift is the day you ovulated.

Tracking your temperature shifts, along with a secondary metric such as cervical fluid, will give you a clear picture of your cycle length and what day ovulation typically occurs.

This information is not only valuable when it comes to training with your menstrual cycle, it’s also incredibly important when trying to conceive, or prevent a pregnancy. In fact, this method, also known as the Fertility Awareness Method (FAM), is what my husband and I used for birth control for 6 years, and is also how we conceived and became pregnant shortly thereafter.

To track your cycles, you simply take your BBT each morning at the same time before getting out of bed with a basal thermometer. You can track your temperature changes on a printable chart, which also includes space to note changes in cervical fluid.

A woman training practicing cycle syncing exercise

How to Start Cycle Syncing Exercise

While there is limited research regarding cycle syncing exercise, studies shows there are factors that may affect your workouts.

First, the rise in core body temperature that occurs after ovulation can affect how quickly you fatigue. One study showed that during the luteal phase, time to fatigue was reduced in hot and humid conditions.[1]

Additionally, studies suggest that insulin sensitivity changes throughout your cycle. Insulin is a hormone produced by the pancreas that escorts glucose out of the blood stream and into muscle, liver, and fat cells.

Estrogen and progesterone mildly influence insulin and cortisol, which can change the way your body utilizes and stores fuel. For example, one study showed that in healthy women, insulin sensitivity was higher during the follicular phase due to higher levels of estrogen. Supporting this idea, another study showed that carbohydrates are used more efficiently in the follicular phase.[2][3]

While these changes are important to note when it comes to optimizing your training, studies show that these differences do not alter overall performance capacity.[4] In other words, you can work with your changing patterns of insulin sensitivity, but your immediate performance capacity is not affected by these physiological changes.

In short, your body is more insulin sensitive at the beginning of your cycle when estrogen is higher, and becomes more insulin resistant during the second half of your cycle when progesterone is higher.

Hormones, Glucose, and Your Energy Levels

So, what does this mean when it comes to cycle syncing exercise? When the body is more insulin sensitive, during the first half of your menstrual cycle, you need less insulin to keep blood glucose levels in the normal range and keep your body’s cells supplied with glucose. During this time, carbohydrates are used more efficiently. As a result, doing higher intensity training like sprints efforts and strength training is ideal. This also lines up perfectly with a peak in your energy levels.

Studies also show that your basal metabolic rate decreases during the follicular phase, hitting its lowest point one week before ovulation. Doing higher intensity training during this time will counteract this change, and give an added boost to your metabolism.[5]

On the contrary, when the body is less sensitive to insulin (or, more insulin resistant) during the second half of your cycle, it has a hard time properly storing glucose. In other words, glucose uptake in muscle and fats cells is impaired. As a result, aerobic efforts—ones that do not require fast access to glucose—are more advantageous during the second half of the cycle. This coincides with a drop in all hormones and your energy.

These factors, combined with the general shifts in energy and fatigue that can occur throughout the menstrual cycle make structuring your training according to your cycle a potential rock-solid strategy for optimizing your workouts long-term.

The hormonal shifts of the menstrual cycle can be used to your advantage when planning your workouts.Click To Tweet

Cycle Syncing Exercise: Week By Week

Now, let’s get into specifics. As a general guideline, cycle syncing exercise is broken down into a 4-week period (pun intended). While the days are set to a 28-day cycle, this can absolutely be customized to your cycle and your needs. The type of workouts you choose to do isn’t what matters. What matters is the intensity.

Note: The “ramp up” begins right when menstruation tapers off. Shift this according to your mensuration length. Also, not everyone ovulates on day 14, so the highest intensity week occurs around ovulation (between days 10 and 16). If you need to shift this slightly to better fit your needs—please do!

Week 1 (Days 3 – 9): The Ramp Up (Increased Load or Intensity)

Week 1 occurs in the first half of your follicular phase. During this time, you can increase the intensity of your training and start lifting heavy. Think of it as a week to “prime” yourself for maximum load and intensity. This is a great time to do interval workouts. Be sure to include a sufficient warm-up, as you’re coming off a down week.

Week 2 (Days 10 – 16): High Load or Intensity

This week is the second half of the follicular phase and rolls right into ovulation. During this time, you may find that your energy is at its peak. To take advantage of this, you can incorporate a few workouts that use max efforts. Now’s the time to attempt a PR. Doing shorter, “all-out” effort sprints is great during this time if it is within your ability.

Week 3 (Days 17 – 23): Aerobic Efforts

Right after ovulation comes the first week of the luteal phase. During this time, you may find you do better with aerobic training. Moderate loads and longer, less intense workouts are ideal. Bike rides, trail runs, or circuit-style training are all great options. As you start to move towards the end of this week, taper your training off according to how your body is feeling as you experience PMS symptoms. Be sure to remain hydrated and be mindful of the fact that your core temperature has increased.

Week 4 (Days 24 – 2): The Down Week

This phase starts when your PMS symptoms start to become more prominent. During this time, you can do light activities like swimming, easy biking, yoga, or just chilling hard. When your period starts, continue to rest. Once it tapers off, start back with the ramp up.

Customizing Your Training Plan

To reiterate, these weeks are a general guideline that is simply meant to break down the menstrual cycle into four phases when cycle syncing exercise. If your cycle is more or less than 28 days, your specific days will likely vary. For example, if you have a 30-day cycle, you may choose to add an extra day or two to your aerobic period according to your symptoms.

As an example, I tend to have fairly intense abdominal cramping 48-72 hours before the first day of my menstrual cycle, which is aggravated greatly by higher intensity training. As a result, my “down” week begins on the last few days of my cycle, and my “ramp up” starts on day 3 or 4.

It’s also important to note that this concept can be adapted to your individual goals and the specific type of training you’re doing. Long term, you absolutely want to be periodizing your training so that you aren’t doing the same thing week after week, month after month. As you shift into different training phases, you can implement the general strategies of training with your menstrual cycle.

When in Doubt, Don’t Stress About Cycle Syncing Exercise

Rest assured, if your period falls on the day of a important workout or on race day, you aren’t doomed to failure. The most important thing you can do is show up well rested, fueled, and with a positive mindset. Furthermore, if you’ve done the proper training and prepared your body for success, your body will perform appropriately, even on day 1 of your cycle.

Finally, because the effects of chronic stress can greatly interfere with sex hormone production, the best recommendation for cycle syncing exercise is to be mindful of managing overall stress. Too much stress can result in chronic cortisol output, which can disrupt your menstrual cycle and lead to symptoms of overtraining, including fatigue, decreased performance, and loss of motivation.

For more information on stress management, including how to build a training plan that’s right for your body and your stress levels, check out my comprehensive program Strong From Home.

Have you started cycle syncing exercise? Tell me about your experience below!

Be strong,

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