It’s been called the closest thing to an exercise pill. And while it might take a bit more effort, there is now no doubt at all that high-intensity interval training is just what the doctor ordered.

Anyone who follows the latest in fitness news knows that HIIT is a hit. A big hit. But high-intensity interval training is much more than a fad – it is a scientifically backed way to build cardiovascular fitness, and research is revealing plenty more health benefits it can bestow. Here are five of the top researched reasons to put HIIT on your own workout list:

Keen to learn more? Watch what happened when the Les Mills Lab teamed up with Dr. Jinger Gottschall to test how HIIT kicks your fitness into overdrive.

It’s clear the research definitely supports HIIT. But what about the science that goes into actually designing an effective HIIT program? In this video, one team of HIIT professionals explain how a combination of expertise, scientific insight and creativity go into the making of a great workout.

As Les Mills Head of Research Bryce Hastings explains, LES MILLS GRIT™ is designed to push the heart rate up as high as possible, as often as possible in a 30-minute phase. “So we design the workout to have these very high spikes of intensity, followed by a complete recovery. And it’s those spikes that generate the types of biochemical changes that are very specific to a HIIT workout.”

The workout is then tested by a team led by Dr Jinger Gottschall to measure its efficacy, and only then made available. They’re looking to see if we’re delivering on that HIIT promise,” says Bryce. “It’s the ‘pill’ that every athlete wants.”

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