Are HIIT workouts, like those at 1Rebel, all you need to sculpt your body?

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HIIT workouts have gained popularity in the last decade with the likes of 1Rebel, F45, Crossfit and The Body Coach successfully bringing this training protocol to the masses and hailing it as THE final answer to getting in shape. So, is the hype to be believed and is HIIT the one-stop solution to sculpting