It turns out the early bird does catch the worm, as scientists think working out in the morning could boost your performance.
Of course, ther are lots of reasons why people hit the gym - perhaps you're keen to improve your fitness or just enjoy exercise.
But if you're looking to burn fat you might want to add morning workouts to your regime, as the time of day you workout can make a difference.
A new study from Karolinska Institutet in Sweden and the University of Copenhagen in Denmark suggests morning exercise can increase your metabolism more than if you were to workout at other times of the day, thanks to the circadian rhythms of cells.
Professor Juleen R. Zierath from the Department of Molecular Medicine and Surgery and the Department of Physiology and Pharmacology, Karolinska Institutet explained: "Our results suggest that late morning exercise could be more effective than late evening exercise in terms of boosting the metabolism and the burning of fat, and if this is the case, they could prove of value to people who are overweight."
However, it should be pointed out the study focused on mice, so there are important differences to be considered, even though 'mice are a well-established model for human physiology and metabolism.'
"The right timing seems to be important to the body's energy balance and to improving the health benefits of exercise, but more studies are needed to draw any reliable conclusions about the relevance of our findings to humans," said Professor Zierath.
Elsewhere, a different study found that while early workouts are perfectly good for your health, exercising in the afternoon or evening might be more useful in cutting your body's insulin resistance.
Conducted by the Leiden University Medical Center in the Netherlands, researchers suggested such evening exercise is best completed between 2pm and 6pm, when your body temperature is at its highest.
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