The exercise theory behind the acronym promises major results from mini time slots – but what’s actually going on beneath the Lycra when you HIIT it hard?
YOUR LUNGS
The clue is in the name. Moving at max intensity is the only way this will work – which is why you’re out of breath. “You need to be at 90 to 100 percent effort for 15 to 30 seconds,” says sports therapist Barry Sigrist. “By working anaerobically (sans oxygen for fuel), you’ll produce lactic acid, which releases adrenaline, helping to move fat around the body.”
YOUR MUSCLES
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