"Keep the workout short and divided into intervals. This will keep you motivated but also allow for breaks," says Gahan. Here's an example: pick eight exercises and complete a four-minute Tabata of each exercise, she says, where you're doing 20 seconds of 110 percent effort followed by a 10-second break. During this break, you're able to cool down slightly to avoid getting too hot, and it brings in some variety to stick with it.