Walk for Cardio

"Number one, walking should be your main form of cardio," says Diamonds, citing research that has shown that it burns the most fat. "I'm not sure it actually burns the most fat, but low to moderate intensity cardio is great, especially for beginners," says Collingood. "Walking is simple—it doesn't take any equipment other than a good pair of shoes," she adds. It can also be social. "Meet friends or family or take the dog with you for a nice brisk walk."