Lack of time is cited as one of the main barriers to fitness ... “A lot of people are super busy, and can’t allot an hour in ...

Quick tip: Avoid doing HIIT workouts less than one hour before bedtime, as vigorous activity has been shown to increase the time it takes people to fall asleep and may negatively impact sleep quality.

We could all use another HIIT workout in the rotation. This one’ll empty your tank in 20 minutes flat, and only requires dumbbells. These fat-burning exercises make for a fast, effective workout.

a basic work-to-rest ratio is one minute work to two minutes rest. A good rule of thumb: you should not be able to talk and work out simultaneously during a well-programmed HIIT workout.

They found the optimal amount of HIIT to complete in one week is a combined 90 minutes for an improvement in health and fitness, with a boost in participants' power and stamina. But any more than ...