Fitness creator Chrissy Chella breaks down the 28-day menstrual cycle into two clear phases and explains exactly how to adjust your training for each one.
Hormonal symptoms, pain, and cycle changes can have multiple causes and should be medically assessed when significant or persistent.
Overview
Fitness creator Chrissy Chella breaks down the 28-day menstrual cycle into two clear phases and explains exactly how to adjust your training for each one.
Cycle or Hormone Details
Phase one is the follicular phase. Day one of your period is the reset button — energy levels are at their lowest, so gentle movement like walking or a light swim is ideal. By day three, estrogen enters the system and energy climbs steadily. This is the time to ramp up intensity: sprints, circuits, and HIIT workouts. Estrogen continues rising until roughly day 14, when testosterone and LH also peak for ovulation. Day 14 is when you'll feel your strongest, most confident, and most energized — the perfect window to chase personal bests and lift heavy. Phase two is the luteal phase. Estrogen drops, progesterone rises, and the body shifts from burning glucose to burning fat. The same HIIT session that felt great in phase one will feel significantly harder. Training shouldn't stop, but expectations need adjusting — lower output is normal, not a sign of regression. As the phase progresses toward the next period, sleep quality declines, bloating increases, and energy bottoms out. Chrissy emphasizes reducing caffeine and screen time before bed during this window to support recovery.
Practical Takeaway
The key message: understanding your cycle means you stop blaming yourself for fluctuating performance. External factors like stress, body fat percentage, and contraception also influence how each phase feels, so the 28-day framework is a guide, not a rigid rule.
Key Takeaways
- Day 1 of your period is the reset — energy is lowest, stick to gentle movement like walking or swimming
- From day 3 onward estrogen rises steadily, making it the ideal window for high-intensity training like sprints and circuits
- Day 14 (ovulation) is peak performance — estrogen, testosterone, and LH are all high, so chase your PBs here
- In the luteal phase progesterone replaces estrogen and your body burns fat instead of glucose — the same workouts will feel harder and that's normal
- Reduce caffeine and screen time before bed in the late luteal phase when sleep quality naturally declines
FAQ
What does this page explain?
It explains how to train on your period — your menstrual cycle explained and how training or symptoms may change across the cycle or life stage.
Do cycle-based recommendations work the same for everyone?
No. Symptoms, contraception, irregular cycles, training load, and medical conditions can all change the picture.
What is the main takeaway?
The main takeaway is to use the information flexibly and match it to the individual rather than forcing a rigid template.
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