High-Intensity Interval Training, or HIIT, is widely regarded as one of the few forms of working out that really works. It involves short bursts of intense exercise to get your heart running at close to its peak, followed by a period of rest.
High-Intensity Interval Training, or HIIT, is widely regarded as one of the few forms of working out that really works. It involves short bursts of intense exercise to get your heart running at close to its peak, followed by a period of rest.