For starters, “if you exercise in the morning after fasting all night, you’re going to burn the carbohydrates and sugars stored in your muscles and liver,” says George Welch, MD, a cardiologist with Manhattan Cardiology. “Once you’re done burning that up, you burn fat—that’s why exercising in the morning burns more fat than later in the day.”
He goes on to say, “You’re least likely to injure yourself later in the day since your muscles are more acclimated,” he tells me. “Your body’s at its most efficient between 3 and 6 p.m., as your temperature rises [and] your muscles warm up.”
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