If all you know about high-intensity interval training (HIIT) comes from what youve seen on YouTube videos, fitness influencer Instagram accounts, or overpriced boutique gym concepts, you might be ...

For this workout, you’ll need a pair of adjustable dumbbells or a dumbbell set and enough room to drop down into a burpee or swing a weight around. HIIT workouts tend to be short, and this home ...

High-intensity interval training is one of the best ways to pack a lot of exercise into a short period of time. HIIT workouts are so efficient because they alternate short bursts of very intense ...

Those mid-class sprint intervals are tough. But experts break down whether they really get you ready for race day.