Since many people are prone to finding excuses for working out, the best time to do it is the time that will enable one to do it consistently. From a medical perspective, however, it may be best to exercise shortly after rising in the morning. The body is more likely to burn off fat following a night fast. Also, a study showed that 75 percent of morning exercisers were likely to still be at it one year later, as opposed to 50 percent of those who exercised at midday, and 25 percent of those who exercised in the evening. It seems that as the day progresses, would-be exercisers are more likely to think of excuses to avoid working out.