Menstrual cycle and strength training: follow your symptoms, not a rigid calendar

Small average effects do not describe every person

McNulty and colleagues’ Sports Medicine review found a trivial average reduction in exercise performance during the early follicular phase. Study quality was often low and results varied substantially. The authors favoured individual responses over broad phase-based instructions. The review concerned naturally menstruating participants; it cannot simply be applied to every contraceptive method or irregular cycle.[1]

That evidence does not establish a need to automatically lift heavy at ovulation, stop lifting during menstruation, or replace your program every week. It also does not dismiss a person whose cramps or fatigue substantially affect a session.

Keep a small, useful record

For several cycles, if tracking feels useful to you, record a few observations after training. Keep the process simple enough that you can compare the same information from one week to another.

• Your symptoms and their severity in your own words.
• The exercises, resistance, and repetitions you completed.
• How hard a familiar warm-up or working set felt.
• Sleep, recent illness, and major changes in life stress.

Look for a repeatable pattern rather than assigning meaning to one difficult workout. If tracking makes you anxious, a simple “usual / lower-energy / need support” check-in can be enough. Menstrual information is sensitive; choose what you record and where you keep it.

Use a three-option session

Let the warm-up provide information. You can lower the load, shorten the session, or stop. Those choices should respond to the person in front of the program, rather than a predicted hormone level from a calendar.

When a change needs more than a program adjustment

New, worsening, or disabling period pain deserves assessment, especially when it disrupts daily life or accompanies other concerning symptoms. Exercise studies on primary period pain do not establish treatment for endometriosis or another underlying condition.[2]

A new loss of periods or persistent cycle changes alongside fatigue, under-fuelling, or recurrent injuries also calls for medical advice. Cycle changes have several causes; neither an app nor a training log diagnoses the reason.[3]