Best time of day to exercise revealed. The age-old debate about optimal workout times has always been met with confusion. While many people swear that early morning workouts are the key to success, others cannot fathom waking up earlier than necessary to do any form of exercise. According to the Journal of Strength and Conditioning, research shows that working out in the evening (HIIT in particular) may be the most beneficial. Scientists have found that strength and flexibility peak in the second half of the day, and that perceived exertion is at its lowest, allowing you to work harder and feel it less. In trying to find an explanation, experts point to the circadian rhythm, since it plays a role in these factors. 

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