There is no right or wrong answer as to when is the best time of day to workout. There are advantages to both morning, afternoon and evening exercise. We all have busy schedules and most people can only exercise before or after work so getting into a routine that works for you and being consistent is all that matters. There are several factors to consider.
First, we have to look at how our bodies function over a 24-hour period. Our biological clock helps regulate when we eat, body temperature, blood pressure and sleep patterns. These are called circadian rhythms which is a 24-hour body clock that signals a myriad of physiological processes like eating and sleeping for example.
It is generally set by light and dark but can be affected by sleep patterns, stress levels and mealtimes. Food and proper rest are important foundations for exercise. If we are in sync with our circadian rhythm, the stress hormone cortisol rises in the morning and remains level throughout the day. It acts as our natural caffeine boost making the morning a great time to work out.