Warm weather encourages people to get outside and stay active, but exercising in high temperatures can put extra stress on the body. Without proper precautions, heat-related illnesses such as dehydration, heat exhaustion, and heat stroke can develop quickly. By understanding how heat affects the body and following a few safety strategies, you can continue to exercise safely during hot weather.
Summer in Ottawa is short — and we're not about to tell you to stay inside.
Whether you're logging kilometres along the Rideau River, playing recreational sports in Barrhaven, cycling the Ottawa Greenbelt trails, or chasing your kids around Chapman Mills Park, staying active through Ottawa's hot summer months is absolutely possible. It just takes a little know-how.
At Nepean Sports Medicine & Physiotherapy Centre, we work with active people in Nepean, Barrhaven, and across Ottawa every day — helping them prevent injuries, recover faster, and keep doing what they love. This summer, we want to help you enjoy the heat safely.
What Happens to Your Body When You Exercise in the Heat?
Your body is remarkably good at regulating its internal temperature — it works hard every day to stay close to 37°C. When you exercise in high temperatures, that job gets a lot harder.Two of your body's main cooling tricks are:
- Vasodilation (widening blood vessels near your skin to release heat outward)
- Sweating (which pulls heat away from your body as it evaporates).
Both methods are effective — but they have limits.
When you're pushing hard in Ottawa's summer humidity, sweat can't always evaporate efficiently, and your body can struggle to keep up. This is when heat-related illness begins to develop — and it can happen faster than most people expect.
Know the Warning Signs: Heat Exhaustion vs. Heat Stroke
- Headache and dizziness
- Muscle cramps
- Clammy, pale skin
- Excessive sweating
- Rapid breathing and elevated pulse
- Nausea or vomiting
- Body temperature elevated but below 40°C
Heat Stroke — This is a medical emergency. Call 911 immediately.
- Body temperature above 40°C
- Hot but dry skin (sweating may stop)
- Confusion or disorientation
- Loss of consciousness
If you or someone around you shows signs of heat stroke, don't wait — call 911 right away.
5 Practical Tips for Exercising Safely in the Heat
1. Time Your Workouts Smartly
The hottest and most dangerous part of the Ottawa summer day is typically between late morning and early evening. Aim to get your outdoor workouts in before 10 AM or after 6 PM. Early mornings are especially great — the air is cooler, the paths are quieter, and the light is beautiful.
2. Stay Ahead of Thirst with Hydration
Here's the thing about thirst: by the time you feel it, you're already dehydrated. Drink water before, during, and after exercise — even if you don't feel like you need it. For workouts lasting longer than an hour, consider a sports drink or electrolyte beverage to replace the sodium and potassium you lose through sweat. Proper electrolyte balance matters for muscle function and recovery.
3. Dress for the Heat
What you wear outdoors makes a real difference. Choose light-coloured, loose-fitting, and moisture-wicking clothing — dark fabrics absorb sunlight and trap heat against your skin. Give your body the ventilation it needs to sweat efficiently.
4. Protect Yourself from the Sun
Sunburn isn't just painful — it actually makes it harder for your body to cool itself down and can put serious long-term stress on your skin. Apply sunscreen (SPF 30 or higher) before you head out, reapply as needed, and throw on a hat to reduce direct sun exposure on your head and face.
5. Find Shade Where You Can
Ottawa has fantastic, shaded trail systems — the Greenbelt paths, the Trans Canada Trail, and wooded areas around Barrhaven are all excellent options when the sun is bearing down. If heat is a consistent barrier, indoor facilities are always a solid backup.
When to See a Physiotherapist After Exercising in the Heat
Pushing through summer training can sometimes lead to more than just overheating. Heat-related stress can worsen underlying muscle fatigue, increase your risk of cramping, and contribute to overuse injuries. If you're dealing with persistent muscle pain, cramps that keep returning, or joint discomfort that's slowing down your summer activity, it's worth getting it assessed.
At Nepean Sports Medicine & Physiotherapy Centre, our registered physiotherapists provide active, preventative, and rehabilitative care to help you stay on track — whether you're training for your first 5K, managing a recurring sports injury, or simply trying to stay pain-free through the summer months.
We serve patients in Nepean, Barrhaven, and across the Ottawa area, and we offer a full range of services including physiotherapy, massage therapy, acupuncture, dry needling, shockwave therapy, nutrition services, and more.
Stay Active, Stay Safe This Summer
Ottawa summers are too good to waste on the sidelines. With the right preparation — smart scheduling, proper hydration, sun protection, and knowing when to listen to your body — you can make the most of every warm day.
And if your body needs a little extra support this season, we're here.
Book an appointment with Nepean Sports Medicine & Physiotherapy Centre today and keep your summer active, healthy, and injury-free.
Serving Nepean, Barrhaven, and the greater Ottawa area.