"The human body has a certain physiological rhythm, and the daily cycle shows peaks and troughs throughout the day," said Brewer. "If your workout can align with these rhythms, it not only makes the exercise more effective, but also makes it easier."
Scientists at the University of Chicago have recently discovered that the best time to exercise is in the evening because cortisol and thyroid-stimulating hormone levels are highest at this time, and these hormones are associated with accelerating metabolism and burning fat.
However, according to experts on bodily rhythms, this is just part of the story. The latest research indicates that not only are specific workouts most effective at certain times of the day, but there is also an optimal time to exercise if you want to boost your energy or improve your mood. The key to all of this lies in the innate biological clock within us.