“HIIT training is extremely efficient. Many people don’t have the time for long, drawn-out workouts and HIIT training is ...

That's why we tapped Gerren Liles, NASM, to lead the Ultimate HIIT program. He's purpose-driven to lead you to the best sweat of your life with these hard-hitting, 15-minute workouts. The HIIT ...

Set up interval training workouts the right way with these expert tips. But instead of putting together a 30-minute, non-stop workout, break up your program into shorter all-out intervals with ...

These trainers are purpose-driven to lead you to the best sweat of your life with their hard-hitting, 20-minute workouts. The HIIT protocol challenges you to redline your heart rate without ...