Does It Matter If You Work Out in the Morning or Afternoon?

Morning people swear fasted AM cardio is the secret. Afternoon people swear their performance peaks later in the day and that's when real training happens. Everybody's got a strong opinion about when you should work out, but does it really matter?

A new review published in Sports Medicine Open (2026) looked at body composition and metabolic health across the board, comparing morning exercise to afternoon or evening exercise. Across the long-term studies, there was no significant difference between morning and afternoon training for body weight, BMI, fat mass, fat-free mass, body fat percentage, or waist circumference.

Cholesterol and triglycerides told the same story. Total cholesterol, LDL, HDL, triglycerides, none of them showed a meaningful difference based on when people trained.

So if your actual goal is losing fat, keeping muscle, or improving your lipid profile, the data here says pick whichever time of day you'll actually stick with. That's the variable that matters, not the clock. You can stop stressing about whether 6am or 6pm is the "optimal" window; for body composition and lipid health, the evidence says it doesn't meaningfully matter. What matters is consistency, showing up for your sessions week after week, and that's almost always driven by picking a time that fits your actual life, not the time some article told you was superior.

If you want help turning your fitness goals into reality, contact us here to get an assessment and talk to a trainer.