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.

Today we're going to do a High-Intensity Interval Training workout, or HIIT, H-I-I-T ... Make sure you're swinging your arms with your legs. All right, five more seconds. All right, 10-second ...

Skip the run — blast through calories with two dumbbells and this 20-minute HIIT workout ...

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 ...

You’ll need a pair of dumbbells, plus maybe some water and a towel, as this workout combines cardio moves and strength exercises. This is also known as ‘high-intensity resistance training’ — ‘HIRT’ ...

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 ...