30 Seconds Summary
Does it matter at which time of day you work out?

  • Our physical strength varies throughout the day due to our circadian rhythm, being generally stronger in the evening.
  • A meta-analysis by Grgic et al. (2019) concluded that resistance training produces similar strength gains regardless of whether it's done in the morning or evening.
  • Muscle size increases are consistent irrespective of the training time, though individual studies suggest evening workouts might slightly favor muscle growth.
  • The differences in strength development over the day can be adapted to by regular training at specific times, suggesting practical application for competitive athletes to align training with competition schedules.
  • Chronotypes, like 'morning larks' or 'night owls,' are not fixed, and the body's biorhythm can adapt to different schedules with proper management.
  • Despite the findings, the quality of data from the studies was noted as mostly mediocre and skewed by short durations and non-trained individuals.
  • For non-competitors, the time of day may have minimal impact on strength and muscle growth, making consistency and personal preference more significant factors.

Track & Plan Workouts
with Ease

  • Unlimited workout logs
  • Automatic volume tracking
  • Personalized programs
  • RPE support, rest timer, and more!
WorkoutWise Screenshot

Read Next

New study: A more even protein distribution can improve your gains

According to the hardcore IIFMY crowd, things like nutrient timing don’t matter for your gains. They say only your total daily macronutrient intake affects your body composition change and strength development over time. Very few evidence-based professionals agree with this point of view and a new s…

MennoHenselmans.com

Menno Henselmans

Does food timing matter for weight loss?

A recent study examined the associations between the timing of eating and weight loss in calorically restricted healthy adults.

Stronger By Science

Eric Trexler

Nutrition Labels Are Inaccurate. And that Doesn’t Matter.

In all but one fringe case, knowing about errors on nutrition labels is fun trivia, but doesn’t actually affect the utility of tracking calorie intake in the real world.

Stronger By Science

Greg Nuckols

Chrononutrition: Why Meal Timing, Calorie Distribution & Feeding Windows Really Do Matter

Meal timing, calorie distribution, and feeding windows matter. In this article, Danny Lennon tells us everything we need to know about chrononutrition.

Stronger By Science

Danny Lennon

Cholesterol: Going Deeper than the Numbers

Time to get familiar with cholesterol, no matter your age! Read on and learn how to maintain healthy levels of this crucial health marker.

Biolayne

Erik Bustillo