Hot yoga safety and hydration: how to take care of yourself in the heat.

Why heat changes things

When you exercise, your body produces heat. In a warm room, it has to work harder to cool itself, mostly by sweating. Mayo Clinic notes that strenuous activity in the heat, especially when humidity is high, makes it harder for the body to cool efficiently, and that losing too much water or salt through heavy sweating can lead to heat exhaustion.

Mayo Clinic also points out that the combination of workout intensity and high temperatures in hot yoga has the potential to cause heat-related illness. That does not mean heated classes are unsafe for everyone. It means the heat deserves respect, and that your own response on the day matters more than anyone else’s pace.

Hydration before, during, and after

Mayo Clinic’s advice for hot yoga is to drink plenty of water before, during, and after your workout. In practice, that means sipping water through the day rather than trying to drink a large amount just before class. Bring a refillable water bottle; we have a water refill station at the studio.

During class, take small sips when you need them. Afterward, keep drinking as you cool down. Pale yellow urine is a common sign that you are reasonably hydrated, while dark urine and extreme thirst can be signs you need more fluid.

Try not to have a full meal right before class. A light snack beforehand is completely fine and can help if you tend to feel shaky when you exercise on an empty stomach.

A note on electrolytes

Sweat contains salt as well as water. For a single 50-minute class, most people can rehydrate with water and their usual meals. If you sweat heavily, take several heated classes close together, or do other exercise on the same day, you might find an electrolyte drink or a salty snack afterward helpful.

Electrolyte products vary a lot in sugar and sodium content. If you have high blood pressure, kidney concerns, or have been told to limit salt, ask your doctor or pharmacist before adding them. More is not automatically better.

Warning signs to stop

Mayo Clinic’s guidance for hot yoga is clear: stop if you feel dizzy, lightheaded, or sick in any way. Other signs of heat exhaustion listed by Mayo Clinic and Health Canada include heavy sweating, faintness, fatigue or weakness, headache, nausea, muscle cramps, a weak or rapid pulse, and extreme thirst.

If you notice any of these, stop moving, sit or lie down on your mat, sip water, and let your instructor know. If you need to leave the room to cool down, that is always okay; for the flow of class we ask that you do not re-enter afterward, but your safety comes first.

Heatstroke is a medical emergency. Health Canada lists signs such as high body temperature, confusion and lack of coordination, fainting, and very hot, red skin, sometimes without sweating. If someone shows these signs, call 911 right away.

Pregnancy and medical conditions

Mayo Clinic recommends checking with your doctor before trying hot yoga, particularly if you are pregnant or have health concerns. It advises skipping hot yoga if you have heart disease, problems with dehydration, heat intolerance, or a history of heat-related illness such as heatstroke.

Some medications can also affect how your body handles heat. If you are unsure, talk with your doctor or pharmacist before booking a heated class. Once you have the go-ahead, tell your instructor about any condition, injury, or pregnancy before class starts so they can suggest modifications.

Simple habits that help

Start with a Mild class, heated up to 30°C, before trying a Hot class at up to 40°C. Choose a gentler format such as Stretch or Observe for your first few visits. Rest in child’s pose or lie on your back whenever you need to. Skip a heated class if you are unwell, very tired, hungover, or already dehydrated.

Over time, you will learn how your body responds to the heat. Our FAQs at /faqs cover studio details, and /classes/mild-heat explains our gentler Mild classes. Listen to your body; it is the best instructor in the room.