High-intensity interval training (HIIT) is the popular workout that never went away, and that’s because it works. Indeed, you can really rev up your fat-burning sessions by working harder for less time – and yes, you can do it with weights, too! Fusing intervals of very intense exercise with short periods of rest, this formula boosts stamina and strength endurance, plus decreases body fat percentage and bolsters health. But it’s not for the fainthearted – you must have perfected every
