Right, let’s talk about something that’s been doing the rounds on social media lately: cycle syncing your workouts. You’ve probably seen the Instagram posts telling you to do HIIT during one week and gentle yoga during another, all based on where you are in your cycle.

Is it actually backed by science, or is it just another wellness trend that sounds good but doesn’t really matter? Well, it’s a bit of both, if I’m honest. But there’s definitely something to it, so let’s break it down properly.

Understanding Your Menstrual Cycle (The Basics)

Before we dive into the exercise stuff, let’s quickly recap what’s actually happening in your body throughout your cycle. Your menstrual cycle has four main phases, and each one comes with its own hormonal cocktail that can affect how you feel and perform.

Menstrual Phase (Days 1-5): This is when you’re actually on your period. Hormone levels are at their lowest, which is why you might feel a bit rubbish and low on energy.

Follicular Phase (Days 1-14): This starts on day one of your period and continues until ovulation. Oestrogen starts rising, which generally means more energy and better mood. You’ll probably start feeling more like yourself again.

Ovulation (Around Day 14): This is when your body releases an egg. Oestrogen peaks, and you might notice you’re feeling particularly energetic and strong. Some women say they feel invincible during this phase (lucky them!).

Luteal Phase (Days 15-28): After ovulation, progesterone increases whilst oestrogen drops. This is when PMS symptoms typically show up – bloating, mood swings, fatigue, the whole lovely package.

Why Your Cycle Affects Your Workouts

Here’s the thing: hormones don’t just affect your mood and whether you fancy chocolate (spoiler: it’s always yes). They also impact your energy levels, strength, recovery, and how your body responds to different types of exercise.

Oestrogen, for instance, is brilliant for building muscle and gives you more energy. When it’s high, you might find you can push harder and recover faster. Progesterone, on the other hand, increases your body temperature and can make exercise feel harder than usual. It also affects how your body uses carbohydrates for fuel.

The science here is still developing, but there’s enough evidence to suggest that paying attention to your cycle can help you train smarter, not just harder.

Week 1: Menstrual Phase (Days 1-5)

What’s Happening in Your Body

Your period has arrived, hormones are at rock bottom, and you’re probably not feeling your best. Energy levels are typically lower, and you might have cramps, headaches, or just feel generally exhausted. Your body is also losing iron, which can make you feel even more tired.

Best Types of Exercise

This is not the week to be a hero. Honestly, just getting to the gym deserves a medal. Focus on:

• Gentle movement: Walking, light yoga, stretching, or easy swimming
• Low-intensity strength training: If you feel up to it, lighter weights with more focus on form
• Pilates or barre: Great for keeping muscles engaged without overdoing it

The key here is listening to your body. Some women feel absolutely fine during their period and can train normally. Others need to take it easier. There’s no wrong answer – do what feels right for you.

Top Tips

• Don’t skip exercise completely unless you really need to. Gentle movement can actually help with cramps and mood.
• If you’re dealing with heavy flow, wear what makes you comfortable and confident.
• Stay hydrated and consider increasing iron-rich foods to make up for what you’re losing.

Week 2: Follicular Phase (Days 6-14)

What’s Happening in Your Body

Your period has finished, and oestrogen is on the rise. This is when most women start feeling more energetic, positive, and strong. Your pain tolerance is higher, and your body is better at building muscle during this phase. Basically, you’re in your power-up phase.

Best Types of Exercise

This is your time to shine! Take advantage of that extra energy and go for:

• High-intensity interval training (HIIT): Your body can handle it better now
• Heavy strength training: Perfect time to try for personal bests or increase weights
• Running or cardio: You’ll likely find it feels easier and more enjoyable
• Trying new challenging classes: Spin, boxing, circuits – go for it

Research suggests that strength training during the follicular phase might lead to better muscle gains. So if you’re trying to build strength, this is when to really push yourself.

Top Tips

• This is a great time to schedule important workouts or fitness tests
• Don’t be afraid to lift heavier or add extra reps
• Your metabolism might be slightly faster, so fuel yourself properly

Week 3: Ovulation (Around Days 13-15)

What’s Happening in Your Body

You’re at peak oestrogen levels, and many women report feeling their absolute best during ovulation. Energy is high, strength is at its peak, and you might feel like you can take on the world. You’ll also have more testosterone than usual, which helps with power and performance.

Best Types of Exercise

Keep the momentum going from last week:

• Maximal strength training: Think heavy squats, deadlifts, bench press
• Explosive movements: Plyometrics, sprints, Olympic lifts if you’re into them
• Competitive workouts: This is when you might hit your best times or lifts
• Endurance training: Your body is efficient at using oxygen right now

Basically, if you’re going to set a personal record, this is probably when it’ll happen. Your body is primed for performance.

Top Tips

• Schedule your toughest workouts during this phase if you can
• Make sure you’re still warming up properly – feeling strong doesn’t mean you’re immune to injury
• Enjoy feeling good! It won’t last forever (sadly)

Week 4: Luteal Phase (Days 16-28)

What’s Happening in Your Body

Oestrogen drops, progesterone rises, and your body temperature increases. This is when PMS symptoms start showing up – you might feel bloated, tired, moody, or just “off.” Your body also shifts towards using fat for fuel rather than carbohydrates, and your breathing rate increases, making cardio feel harder than usual.

Best Types of Exercise

This is the time to dial things back a bit:

• Moderate-intensity cardio: Steady-state runs, cycling, swimming at a comfortable pace
• Strength training with moderate weights: Focus on maintaining rather than pushing for PRs
• Yoga and stretching: Brilliant for managing stress and bloating
• Walking: Never underestimate a good walk for your mental health

You might find that workouts just feel harder during this phase, and that’s completely normal. Your heart rate might be higher for the same effort level, and you might get out of breath more easily. It’s not that you’re suddenly unfit – it’s just hormones doing their thing.

Top Tips

• Don’t beat yourself up if you need to take it easier
• Focus on how exercise makes you feel rather than performance metrics
• Consider slightly longer rest periods between sets
• Increase your carbohydrate intake if you’re feeling particularly tired

What If Your Cycle Is Irregular?

Not everyone has a textbook 28-day cycle, and that’s completely fine. If your cycle is irregular, you can still use these principles – just pay attention to how you feel rather than strictly counting days.

If you’re on hormonal birth control, your cycle might be quite different or non-existent. Some types of contraception suppress ovulation entirely, which means you won’t get those hormonal fluctuations. More on that in another post!

Is Cycle Syncing Really Necessary?

Here’s my honest take: no, it’s not necessary. Plenty of women train consistently throughout their cycle and do absolutely fine. If you’re training for something specific or you’re an athlete, you might not have the luxury of backing off during certain weeks.

But if you have the flexibility to adjust your workouts, and you find that certain times of the month are consistently harder, then why not work with your body instead of against it? It’s not about being lazy or making excuses – it’s about training smart.

The Bottom Line

Your menstrual cycle affects more than just whether you need tampons. Understanding how your hormones fluctuate throughout the month can help you plan your workouts more effectively, avoid burnout, and maybe even see better results.

The key is listening to your body. If you feel great during your period and want to smash a heavy workout, go for it. If you feel terrible during ovulation and need to take it easier, that’s fine too. There’s no one-size-fits-all approach here.

Track how you feel during different phases of your cycle for a few months. You might notice patterns that help you plan your training better. Or you might find it makes no difference at all. Either way, you’ll know your body better, and that’s never a bad thing.

Now if you’ll excuse me, I’m in my luteal phase, which means I’m off to do some gentle yoga and then eat crisps on the sofa. Take care! x

Ready to Learn More?

Explore the complete guides:

• Women’s Health and Hormones

Understanding Your Cycle:

• How to Exercise During Your Menstrual Cycle: A Week-by-Week Guide
• Can Exercise Really Help With PMS? Here’s What the Science Says
• Which Painkillers Work Best for Periods?

Managing Hormonal Conditions:

• PCOS and Exercise: What Actually Works (And What Doesn’t)
• Endometriosis and Fitness: How to Stay Active When Everything Hurts

Life Stage Changes:

• Perimenopause and Exercise: Why Your Usual Routine Might Not Be Working Anymore
• Menopause and Fitness: The Importance of Exercise for Women’s Health

Supporting Your Hormones:

• The Best Foods for Hormonal Balance (That Don’t Involve Eating Like a Rabbit)
• Birth Control and Your Workouts: What You Need to Know