Plan to practice on an empty stomach. If you need a snack, eat a piece of fruit or something light before class. One of the benefits of yoga is its detoxification of the body. Drinking lots of water will help flush the toxins out of your system, so do hydrate well both before and after class. As you don’t want to extinguish all the internal heat you are trying to build during class, if you need to drink while practicing, take small sips. Drink up when you’re done!