When do you work out? Are you an early riser that always gets their run in before the day starts, or are you unable to move in the mornings and prefer an afternoon workout?

You might naturally be a morning or an evening person, but have you ever wondered what’s best for your body? Is there an optimal time when your body is primed for losing fat and gaining muscle?

The debate is fierce. On one side, you have people who swear morning workouts are the greatest thing since sliced bread; on the other, you have people who wouldn’t dream of working out in the mornings because they “know” you’re “supposed to” work out in the evening.

Who is right? Is there even a right answer? In this week’s article, we lay out the facts on the table to tackle this hotly debated question.