PR or PMS? Why did that run feel like that?
A run feels effortless one week, then the same pace feels brutal the next.
The brutal runs tend to land in the days before or during your period.
Your heart rate runs higher for the same effort at certain times of the month.
You have called yourself unfit or lazy on a day that was probably hormonal.
Heavy legs, worse sleep, and low motivation seem to arrive on a schedule.
When you actually track it, your good and bad runs line up with your cycle.
Your hormones shift across your cycle, and so do your energy, heart rate, temperature, and recovery, which means the same workout can feel wildly different depending on the week. Most plans ignore this entirely, so you end up blaming yourself for a bad run that was never about fitness. This quiz sorts the fitness story from the cycle story.
What your result could be
It Was Your Cycle, Not Your Fitness
A Bit of Both
Genuinely a Fitness Thing
How Phaes helps after the quiz
The same run can feel completely different week to week, and blaming your fitness for what was really your cycle is exhausting and wrong. Phaes does not just track your cycle and symptoms, it turns them into a running and strength plan that leans into the weeks you are strong and eases off when the same effort costs more, so your training finally works with your physiology instead of against it.
Questions women ask about this
Why is running harder before my period?
In the days before your period, progesterone is high and then both hormones drop, which can raise your heart rate and core temperature, worsen sleep, and increase fatigue and perceived effort. So the same pace genuinely feels harder, even though your fitness has not changed. It is a real physiological effect, not a lack of discipline.
Should I change my training across my cycle?
Many women benefit from it. A common approach is to lean into harder efforts and heavier strength work in the weeks you tend to feel strong, and prioritize easy running and recovery when you usually feel flat. The details vary person to person, which is why tracking your own pattern, rather than following a generic template, is what makes cycle-based training actually work.