Energy drinks 'waste of money' in gym
Nick Hudson, national fitness manager for Virgin Active, said those doing workouts of less than two hours did not really benefit from the drinks.
He said: "They're certainly useful for people who compete in very long distance events.
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Hide Ad"Your body is generally thought to be able to store enough glycogen (a form of glucose] to last roughly two hours and marathon runners swear by them.
"But those doing shorter, more intense workouts don't really benefit physiologically."
Mr Hudson said people trying to lose weight should avoid the drinks altogether, or opt for a low-calorie version.