New York–based trainer Noam Tamir, CSCS, owner and founder of TS Fitness NYC, created this HIIT workout as part of our 5 Minutes of Movement Challenge to keep you active all month long. If you're ...

Another study led by the University of Macau found that participants who performed 20-minute HIIT workouts 4 days a week for 5 weeks improved their oxygen consumption by 9%. Why is a HIIT workout ...

HIIT sounds very scientific ... If you’re doing longer, 3- to 5-minute intervals, you’re working in your VO2 max zone, or about 95 percent of your max heart rate (or a 9 on a scale of 1 ...

HIIT can take your training and performance to the next level. Here’s everything you need to know from the research that backs it to the experts that utilize it.