Running has a huge number of benefits. The popular workout can prevent disease , improve mental health , and even slow the biological ageing process .

But around 31% of us aren't regularly doing enough physical activity – including going for a run. The most commonly cited barrier to exercise is a lack of time .

But what if all the benefits of running could be had, but in a fraction of the time? This is where interval running comes in.

Interval running is a form of high-intensity interval training (HIIT). HIIT has been around for almost a century, but gained popularity throughout the 90s and 2000s thanks to workouts such as Tabata (20 seconds of intense exercise, ten seconds of rest) and CrossFit (a high-intensity workout that combines weightlifting, gymnastics, and cardio)

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