A 90-minute Bikram hot yoga class does as much for your cardiovascular system as 90 minutes of jogging – and does it faster, because the heat helps get you up to target rate sooner.
And it does less to the rest of your body. It loosens up and lubricates your tendons, joints and muscles faster. It makes you sweat and out the acids that exercise builds up in your body – acids which cause or aggravate aches and pains – faster. And it floods your system with endorphins, the natural antidote to pain.