Exercise and Immune System: A Parent's Winter Guide

It is that time of year. One child brings a cold home from nursery, it works its way round the whole house, and just as you are recovering, the next one arrives. Lots of parents ask me whether getting fitter will stop them catching everything. The honest answer about exercise and immune system health is more nuanced than the “boost your immunity” headlines suggest, but there is still plenty that is useful to know.

Here is a balanced look at what regular, moderate exercise may do for your general health through cold and flu season, what it will not do, and how to train sensibly when the bugs are flying around.

What we can say, and what we cannot

The NHS page on the benefits of exercise describes regular physical activity as one of the best things you can do for your overall health, linked with lower risk of a range of serious long-term conditions and better mood and sleep. Research on regular moderate exercise and infections such as colds is encouraging, but it is not as clear-cut as some fitness marketing makes out.

So I will not tell you that a bootcamp class will stop you getting a cold. Nothing will do that reliably when you have small children. What regular activity can do is support the things that help your body cope: decent sleep, better mood, a healthy weight, stronger heart and lungs and less stress.

Exercise and immune system health: the moderate sweet spot

The general pattern most experts describe is this:

• Doing nothing is not great for your overall health.
• Regular, moderate activity, like brisk walking, cycling, swimming or a class where you are working but can still talk, is the sweet spot for most people.
• Very long or very hard efforts, especially when you are also short on sleep and food, can leave you run down for a while afterwards.

For busy parents, that last point matters most. If you go from nothing to five intense sessions a week in January, on four hours of sleep, you are more likely to feel wiped out than bulletproof. Recovery matters as much as the training itself.

A simple winter routine that supports general health

This is what I suggest to parents from October to March:

1. Move most days. Aim for the NHS target of 150 minutes of moderate activity a week from the adult physical activity guidelines. That is 30 minutes, five days a week, and walking the school run counts.
2. Strength train twice a week. 20 to 30 minutes: squats, push-ups, rows, lunges and a plank. Keep 2 or 3 reps in the tank on every set.
3. Keep the hard stuff short. If you enjoy intervals, 10 to 15 minutes of harder work is plenty, once or twice a week.
4. Protect sleep first. If you only manage one thing on a bad week, make it an earlier bedtime rather than an extra workout.
5. Get outside in daylight. A lunchtime walk helps with mood in the darker months. The NHS also advises considering a daily 10 microgram vitamin D supplement between October and March, which I go into in vitamin D in the UK winter.
6. Eat a mostly balanced diet. Plenty of fruit and veg, enough protein, and not crash dieting through the winter.

The other things that matter just as much

Exercise sits alongside the basics. The NHS pages on the common cold and flu cover how these spread and how to look after yourself. Hand washing, catching coughs and sneezes in a tissue and, if you are eligible, getting the flu vaccine all make a real difference. Exercise is one piece of the picture, not a replacement for the rest.

Should you train when you are ill?

A common coaching rule of thumb is the “neck check”:

• Symptoms only above the neck (runny nose, mild sore throat): a gentle walk or easy session may be fine if you feel up to it. Drop the intensity.
• Symptoms below the neck (chest tightness, a chesty cough, aching muscles, fever, upset stomach): rest. Do not train.

This is a rule of thumb, not medical advice. If you have a high temperature or feel properly unwell, rest and follow NHS guidance. And please stay home from group classes when you are contagious. The other parents in the room will thank you. I cover this in more depth in should you exercise with a cold, and the return to training afterwards in getting back to exercise after illness.

A 15-minute “keep ticking over” session for sniffly weeks

When you are not ill enough to rest but not well enough to train hard:

• 5 minutes easy marching or walking
• 2 rounds of: 10 slow squats to a chair, 8 wall push-ups, 10 glute bridges, 30 seconds of cat-cow
• 5 minutes of gentle stretching and slow breathing

If you feel worse during or after it, stop and rest.

Where a bootcamp fits

The value of a class is not that it makes you immune. It is that it keeps you consistent through the dark months, which is when most people drift off. Classes run indoors in a church hall in Archway, so rain and early darkness are not an excuse, and with a maximum of 10 people you get coaching on how hard to push on any given day. The SYP Recharge energy and focus class is a good one for those grey winter weeks.

FAQs

Does exercise boost your immune system?

Regular moderate exercise is linked with better general health, and it supports sleep, mood and fitness. It will not make you immune to colds, especially with young kids at home, but it is one healthy habit among several.

Can too much exercise weaken your immune system?

Very hard or very long training, combined with poor sleep and under-eating, can leave you run down. For most busy parents, moderate training with good recovery is the safer approach.

Is it OK to work out with a cold?

If symptoms are mild and only above the neck, a gentle session may be fine. If you have a fever, chest symptoms or body aches, rest. Stay away from group classes while you are contagious.

What is the best exercise for staying healthy in winter?

A mix of brisk walking, two short strength sessions a week and something you enjoy enough to keep doing. Consistency matters more than intensity.

Book your first class

If you want to stay consistent this winter without overdoing it, come and join a class. SYP Bootcamp runs 45-minute small-group sessions indoors in Archway N19, max 10 people, £15 a class, with easier and harder options for every move. Book your £15 class here, or call or WhatsApp me on 07301 512215. If you would like a 1-1 plan that works around your family’s sick weeks, have a look at private personal training in Archway.

About the author

Artem Olekhnovych is a personal trainer in Archway and the founder of SYP Fitness and SYP Bootcamp. He has coached clients in Archway, Highgate and across North London for over 10 years, and runs small-group bootcamp classes for busy mums and dads. Read reviews from his 1-1 clients.