When you picture the typical high-intensity interval training (HIIT ... So what happens when you need a spicy HIIT circuit that focuses on the arms, shoulders, chest, and back?

HIIT workouts alternate between short ... Remember to pump your arms and get your body involved. Keep your head up and look forward without slouching your shoulders or back.

HIIT workouts speed up the metabolism ... Jump both feet out to the sides as you raise the arms out to the sides and up overhead. Bring the arms down as you jump the feet back to center.

Thrusters (8 reps): Start with a squat, then, as you drive up, press your arms overhead. This compound exercise builds ...

Boxercise has been around since 1992, and it's picking up steam again. Level up your workout routine with this high-intensity ...

Barre is entering the fitness mainstream. One writer makes it her mission to go to two barre classes a week, for a month, at ...

That’s why I was excited to stumble across this 10-minute workout from Chris Hemsworth and his longtime trainer turned friend ...

Discover the results of trying celebrity workout routines like Gerard Butler's 300 workout and Britney Spears' fitness plan.

High-intensity interval training workouts, or HIIT, which involve bursts of high-intensity effort followed by short rest periods, are almost unmatched in their efficiency. These workouts can take ...

She creates safe, inclusive workout programs for everyone—including beginners and expectant or postpartum moms (and even filmed this HIIT workout 18-weeks pregnant!). This routine is structured ...