Endometriosis is not a bad period. It is a chronic condition that can hijack your training, flatten your energy and make you feel like your own body keeps tearing up the plan. If you have it, you are not soft and you are not making it up. Let us talk about how to keep training like an athlete around it.
Endometriosis is where tissue similar to the lining of the uterus grows outside it. It affects roughly 1 in 10 women of reproductive age. It can cause severe pelvic pain, crushing fatigue, pain during or after exercise, heavy bleeding, gut symptoms and a lot of justified frustration with a system that is still slow to name it. The World Health Organization puts the average time to diagnosis at between four and twelve years, and recent UK research puts it at close to seven. If that is you, I see you, and none of this is in your head.
Does exercise actually help, or is that wishful thinking
The honest answer is cautiously yes, with real caveats, and I want to give you the caveats properly rather than selling you something.
A systematic review published in 2025 looked at exercise for endometriosis and found that physical activity appears to improve quality of life, and may reduce pain and psychological symptoms such as low mood. The exercise studied included aerobic work, resistance training, lumbopelvic stretching, yoga and progressive muscle relaxation.
Now the caveats, because they matter more than the headline. That review pooled just six randomised trials covering 251 women in total, and only two of them could be combined statistically. The results on pain were genuinely mixed: some trials found a benefit, one found pain fell equally in both the exercise and control groups, and one was too small to show anything. The yoga finding that gets quoted everywhere comes from a single trial of forty women, in which the control group also received physiotherapy and roughly thirty percent of participants dropped out, all of them from the yoga arm. The review authors themselves call for better, longer trials before firm recommendations can be made.
So here is where that leaves us. Exercise will not shrink lesions or fix the underlying condition. What it can realistically do is help with pain perception, mood, sleep and the sense of control that this condition loves to steal. That is genuinely worth a lot. Just do not let anyone, including a wellness influencer, sell you movement as a replacement for proper medical treatment.
So we train for the reasons exercise is actually good: because you are an athlete, because it helps you feel like yourself, and because a strong, well-fuelled body copes better with almost everything. We do not train as a punishment, and we do not train to earn the right to rest.
The flare is the planning problem
The thing that wrecks most training plans with endometriosis is not the condition on a good day. It is the unpredictability. You can feel strong and capable on Monday and be absolutely floored by Thursday. A rigid plan built for a body that performs identically every single day will set you up to feel like a failure every single month, and that is a confidence problem as much as a physical one.
So we build a plan with gears. Not one fixed programme that only works when you feel perfect, but a green, amber and red version of your week that you can shift into depending on how your body is actually behaving that day. This one change takes the guilt out of adapting, because adapting is now the plan, not a deviation from it.
The green, amber, red system
Green: symptoms quiet
Train your normal plan. This is when you bank your key sessions, your longer efforts and your intensity. Do not hold back out of fear of a flare that is not actually here. Make the absolute most of the good window, because that is where your fitness is built.
Amber: niggling symptoms, lower energy
Keep moving but drop the intensity and the pounding. Swap the hard run for easy aerobic work, a swim or an easy spin. Keep the volume gentle and the effort conversational. Movement often helps amber days rather than hurting them, so do not default straight to the sofa the moment you feel a twinge.
Red: flare, significant pain, heavy bleeding
Rest, or do only gentle restorative movement if it genuinely helps, such as walking, light mobility or breathing work. This is not lost training. Forcing a hard session through a real flare rarely goes well and can leave you worse for days, costing you more than the session was ever worth. Protect the week, not the single workout.
The mistakes that make it harder
Pushing through every flare to prove you are tough
Endurance culture rewards suffering, and that is exactly the wrong instinct here. Training hard through a genuine flare does not build grit or character. It usually extends the flare, trashes your recovery and costs you more days than it ever saves. Toughness here looks like knowing when to back off.
Abandoning training the moment any symptom appears
The opposite trap, and just as common. Many women with endometriosis feel noticeably better for gentle movement. Going fully sedentary at the first twinge can stiffen you up, flatten your mood and chip away at the fitness you worked for. Amber days usually still want some movement, just the gentle kind.
Ignoring the fuelling and iron side
Heavy, frequent bleeding drains iron, and iron deficiency has been shown to impair endurance performance by roughly three to four percent. Under-fuelling on painful days, when your appetite drops and cooking feels impossible, quietly makes every symptom worse. Eat even when you do not feel like it, and ask your GP to test your iron rather than guessing or self-supplementing.
Training in silence and telling your coach nothing
If the person writing your plan has no idea what is going on, they cannot build it to flex. You do not owe anyone your full medical history, but a coach who knows the basics can be the difference between a plan that fits your life and a plan that fights you every month. Say enough to be helped.
Racing with endometriosis
Racing is absolutely possible and plenty of women do it, and do it well. The extra layers to think about are timing, pain management and gut symptoms. If your symptoms track your cycle, look at where race day is likely to fall and talk to your specialist early about any options for managing that window. This is not something to start experimenting with in the final week before the gun goes, and any hormonal approach to shifting your cycle carries its own risks that belong in a proper conversation with your doctor.
Endometriosis often brings gut symptoms, so your race fuelling needs practising hard in training, not winging on the day with whatever the expo was handing out. Keep your race fuel simple, tested, and easy on your particular stomach. Build a plan B in your head for a bad-symptom day, so that if you wake up flaring you already know whether you are racing adjusted, switching to a softer goal, or sensibly pulling out. Deciding that in advance takes the panic and the last-minute heartbreak out of it.
Free tool
The Recovery Check
Ten scored questions that tell you whether what you are feeling is normal training fatigue or something that needs backing off, or a doctor. Useful on the days you cannot tell.
Open the toolBuild a body that copes better
Pain and fatigue are easier to handle in a strong, robust body than in a deconditioned one. Strength training will not treat your endometriosis, but it builds muscle, supports your bones, lifts your mood through the same mechanisms exercise always uses, and hands you a sense of capability on the exact days the condition is trying to take that away from you. Two sensible sessions a week, built around the big movements, is plenty to get most of the benefit.
Core and pelvic floor work deserve a particular mention, because endometriosis and pelvic pain so often travel together. Gentle, well-coached pelvic and lower-abdominal work helps some women, though it is very individual and a pelvic health physio is the right person to guide it rather than a random routine off the internet. If something hurts in a sharp or unfamiliar way, that is information to take to a professional, not a cue to grit your teeth and push harder.
Manage the fatigue, not just the pain
Everyone focuses on the pain because it is dramatic, but for a lot of women the fatigue is the bigger thief. Endometriosis fatigue is not ordinary tiredness and it does not always lift with a good night of sleep. It can flatten a whole week with almost no warning, and training hard through that kind of fatigue tends to dig the hole deeper rather than build anything you can actually use.
Treat your energy like a budget. On low days, spend it on the things that matter most to you and let the optional extras quietly go. Protect your sleep fiercely, because it is one of the very few levers that genuinely moves the needle here. And fuel consistently, because running on empty turns manageable fatigue into the kind that ends training blocks. An easy day honestly taken is worth far more than a hard day half-finished and then regretted for three days afterwards.
Drop the guilt, it is not helping you
If there is one thing I want you to take from all of this, it is permission to stop treating your body like it is letting you down. It is not. It is managing a chronic condition and still turning up to train, which is quietly remarkable when you actually sit with it. The guilt that comes with adjusting plans, missing sessions and watching other people train freely is real, and it is also completely useless to you. It changes nothing except how you feel about yourself.
Consistency with this condition does not look like never missing a session. It looks like always coming back to the next one. The athlete who trains around her endometriosis for years, flexing and adapting and flatly refusing to quit on herself, ends up miles ahead of the one who demands perfection, burns herself out chasing it, and eventually gives up altogether.
When other people do not get it
You will meet people, sometimes including medical professionals, who treat endometriosis as just bad periods that you ought to be able to push through. That is exhausting, and it is wrong. You do not need to justify your experience to anyone, and you are completely allowed to keep looking until you find a specialist, a physio and a coach who actually listen to you and take it seriously.
Surround yourself, as far as you reasonably can, with people who get it. A training partner who understands why you swapped the session for an easy spin, a coach who built your plan to flex in the first place, a specialist who believes what you tell them. The right support does not make the condition vanish, but it lifts an enormous weight off the carrying of it.
Start exactly where you are
If you are reading this freshly diagnosed, or still fighting to get a diagnosis taken seriously, do not wait for everything to be sorted before you start training sensibly. You do not need a perfect plan or a pain-free body to begin. You need a flexible structure, honest communication with the people supporting you, and full permission to adjust without guilt. Start with whatever your body will give you this week, and build quietly from there.
And if today happens to be a bad day, let today be a bad day. Rest, fuel, be kind to yourself, and trust that the good window is coming back around, because with this condition it always does. You are allowed to be both a serious athlete and a woman managing a hard chronic illness at the same time. Those two things are not in competition. They are simply both true at once.
Above all, measure your training in months and seasons, not single days. A flare week is a rounding error across a year of consistent, intelligent work. The athletes who thrive with this condition are not the ones who somehow never flare. They are the ones who stopped treating every flare as a personal failure, built a plan that simply bends and keeps going, and kept showing up for the good windows. You can be one of them.
What to eat in each phase of your cycle, with a shopping list for each one.
Is this you?
- Your plan looks great until a flare hits and then you feel like you have blown the whole block.
- You either push through the pain and pay for it badly, or stop entirely, with nothing in between.
- You want to train for something real but you are scared your body simply will not let you commit.
Ready to stop guessing?
I coach female endurance athletes with plans built around real bodies and real lives. If you want yours built properly, come and work with me.
Apply to work with me →Frankie x