There's no science to suggest a short workout is best, according to a celebrity personal trainer — here's how long he says you should work out for

• Dan Roberts is a personal trainer to models and actors.
• He has a background as an athlete, a sports coach, a pro fighter, and a trainer.
• He's working to dispel some myths in the industry — and one of them is the idea that HIIT training is the best way to get results.
• Instead of a short 20-minute burst, Roberts believes we should all be exercising hard for an hour a day.

It would be hard to beat Dan Roberts when it comes to experience in the world of fitness.

Now a personal trainer to models and movie stars, Roberts has been a sports coach, a pro fighter, a strength and conditioning trainer in New York, Australia, and London working with elite and pro athletes and sports teams, and an in-house trainer for a big modeling agency working with Victoria's Secret models.See the rest of the story at Business Insider

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