There is substantial controversy in the exercise community regarding the optimal time of day to exercise. Is one time truly superior to another, and if so, why?
Let's get this out of the way: the optimal time to exercise is whenever possible. Not everyone's schedules allow for a 90-minute workout.
If you can only exercise before work, the morning is the best time. If you save physical activity for busy evenings, chances are you won't get to it.
Similarly, if you only have time for a 20-minute workout and that's right before bedtime, then that's when you should do it.
Whenever you have the opportunity to work out is ideal, but the greatest time of day to exercise is the time you will actually commit to doing it on a regular basis.
If you only have 20 minutes at night but you keep forgetting to use them, maybe you might see if there's time in the morning.
The truth is that consistent exercise leads to better weight loss and fitness results in the long run.
According to research, your body can adapt to consistent training regimens, so if you go out every morning, you'll probably grow a lot better at it.
That being said, as decades of scientific research has shown, both morning and night workouts offer advantages and disadvantages.