High-intensity interval training, aka HIIT, is one of the best ways to maximize your workout time. Burn a ton of calories and boost your metabolism in little time with celeb trainer Astrid McGuire's full-body HIIT workout. It may be only 10 minutes long,
Get ready to take your workout to the next level with Jessica Alba's CrossFit trainer, Yumi Lee. This workout is excuse-proof: you don't need any equipment, and it's only 10 minutes long, but it will definitely get your heart pumping.