Although most people like to exercise in the morning, claiming it is better than coffee, there is no evidence that it is better for you. I prefer to exercise around 3 p.m. when I generally feel like taking a nap. I do agree with the morning exercise folks – exercise is better than coffee.
Recently a neurologist from Northwestern University challenged the age old convention of "early to rise and early to run – get the exercise done.” Dr. Phyllis Zee believes the best time to work out is in the late afternoon, between 2 and 4 p.m., since that is when your muscle strength is at its peak and people are more alert and wake . Meaning you will be less likely to injure yourself. Your body temperature is also about 2 degrees higher so warming up should be easier too.
On the other hand, some health experts recommend exercising in the morning because the body's metabolism can get an early start at burning calories and sustain that higher metabolic rate during the hours after exercise.
Fit's take: Exercise is important and fitting it into your day, morning or afternoon, can be tough. Since there are advantages to working out at either time, I say go with your personal preference.