Presented by Athleta, this HIIT workout is basically a guaranteed confidence boost. Celebrity trainer Amanda Butler leads you through two different rounds of full-body interval training, helping you ...

Ashley Joi brings the heat in this fiery abs and booty workout. This 30-minute class consists of four blocks packed with a variety of glute and abdominal exercises. Get your heart rate up as Joi ...

I’m usually a firm believer that if something’s worth doing once, it’s worth doing three times — at least where exercise is concerned. However, if I’m heading into a full-body workout or HIIT class ...

Add Yahoo as a preferred source to see more of our stories on Google. Man doing dumbbell lunges. Skipping leg day is a non negotiable, but sometimes an hours workout just isn’t doable, even 45 minutes ...

You’ve heard of high-intensity interval training and you’ve burpeed your way through a 7 a.m. HIIT class, but have you ever stopped to think about how all that punching, jumping, planking and lunging ...

In this workout presented by Samsung Health, fitness trainer Mercedes Owens has designed a HIIT workout to improve your running power and speed. Expect lunges, squats, and mountain climbers. This ...

Welcome to a high-energy ab workout that will leave you feeling strong and sculpted. High-intensity interval training (HIIT) is the perfect blend of cardio and strength training. When you focus on ...