Julia Sullivan is a health and fitness writer, editor and content strategist well as a certified personal trainer. Her byline is in many publications from Harper's Bazaar to SELF Magazine to brand ...

Scientists say you may not need to work out every day to lose fat. In a recent study, participants who did one to three HIIT workouts a week saw reductions in fat mass. Here, fitness experts break ...

When it comes to zone 2 vs HIIT training, it feels like there’s a new study published every other week about which method trumps the other for fitness. So, we consulted the experts for their final ...