Why Your Weight Goes Up Before Your Period (and Drops 300-400 g After): What Our Online Training Sessions Showed Us

Across the YourTrainer coaching sessions we sampled, periods or cramps came up in 16% of them, and every time, the coach changed the plan on the spot. The scale usually jumps 0.5-1 kg on day 1-2 from water retention, then drops 300-400 g in the days after the period ends. Here is exactly what our coaches change, in their own words.

Case study: N., 30s, working professional, trains three mornings a week

N. had been logging her weight daily. On 5 August it read 68.7 kg. By early September it was 68.4 kg, but on her period day 2 she wrote "bloating, 68.4" and told her coach, "I'm not going down at all."

Her coach, Tanmana, did not change the plan. She changed the reading of the plan:

"That's why I have said just note down period day one, period day two, so that we can analyse how your body responds. It's normal. During the first or second day weight goes up slightly, and after the period you lose 300-400 grams."

That day's class became upper body only: dumbbell rows, presses, band work. No squats, no jumping jacks. Cardio was moved to a fasted morning walk on the following two days instead. N. left the class with a target instead of a worry: 66 kg before her trip to India, "easily, if we focus on the diet."

What our coaches actually change on day 1 and 2

From our case studies, this is the real protocol, not a theory:

1. Ask first. Tanmana opens the class with "today is your period day 3, any cramps?" before anything else. If a client says she just got her period two hours ago, the plan changes on the spot.
2. Switch to upper body or mobility. Rows, presses, curls, band pull-aparts. No lower-body loading, no plyometrics.
3. Cramps: stretch and hydrate. Gokul's line to a first-timer: "You can reduce the cramps by the stretching and proper hydration." Severe cramps get a heat bag and rest, one client's class was cancelled the same day with the advice to sleep and drink cinnamon water.
4. Keep the steps. Daily step count stays on the plan because it's activity, not exercise.
5. Read the scale after the period, not during. The 300-400 g drop is the number that actually reflects progress.

Two more women from the classes

K., sharp pain 4-5 days before her period

K. warned her coach in advance. The class was lighter on those days and back to full strength once the pain passed. Her coach's note at the end of the block: "I am seeing overall progress in strength, in flexibility, in confidence also."

S., heavy cramps and a blood test

After a week of unusual swelling and fatigue, S. got a blood panel: iron, folic acid and vitamin D3 were all low. Two days into supplementation the swelling was noticeably down. Her coach's comment was not about training at all: "Sleep is very much important. Recovery is very much important, otherwise hormonal imbalance will happen."

Why the scale moves

Water is used, not stored. Hormonal shifts before and during the period hold a little extra water and slow digestion, that's the 0.5-1 kg. It is not fat, and it leaves on its own. Fat loss over a month is decided by the calorie balance across all 30 days, which is why our coaches ask clients to read the monthly trend line, not the day-2 number.

What our coaches want you to stop doing

• Skipping the whole week, day 1-2 lighter, the rest of the week normal
• Weighing yourself on day 1 or 2 and changing the diet because of it
• Doing jumping cardio "to make up for" a light day
• Ignoring pain that is sharp and lasts, cramps are dull; sharp, localised pain is a doctor conversation, see /health-sources

Clients managing PCOS or thyroid conditions often see a more exaggerated version of this pattern, our PCOS & hormonal coaching and thyroid coaching programs build the cycle-tracking habit in from week one. See also our PCOS diet guide and thyroid diet guide.

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• PCOS vs Thyroid Weight Gain: How to Tell the Difference
• Knee Pain During Squats: 3 Fixes Our Coaches Used in Real Sessions
• How Long Does It Take to See Results From a Personal Trainer?

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