How safe is hot yoga?

As long as you stay hydrated, hot yoga is just as safe as yoga in more moderate temperatures. - AFP Photo

Hot yoga – and hot barre and hot spinning classes – is a booming trend, with yogis crowding into sweltering rooms to twist their bodies to the point of exhaustion. But whether or not yoga in heated rooms, sometimes up to 40.5 degrees C, is safe has been a point of contention.

Now a new, small study suggests it's perfectly safe for healthy adults, as long as it's not too hot.