Straps, when used properly, help us to increase our flexibilty in poses where our lack of flexibility prevents us from doing much at all. Straps also let us hold those poses we wouldn't be able to hold otherwise. All great stuff, you say, provided you have straps just lying around at home. But you don't actually need a strap to use a strap. Here's a little video that shows you how to use a towel (something you should have lying around at home) as a strap. Happy stretching, people. Remember, it may hurt now but it'll feel really good later.