At a glance:
- For most people, muscle strength and endurance are statistically better during evening workouts, as body temperature peaks in the afternoon.
- Fasted morning training increases fatty acid oxidation during exercise, but your daily calorie deficit matters more for fat burning.
- Testosterone levels are naturally highest in the morning—this may offer an advantage for strength training.
- The best time to train is the time you can stick to week after week—consistency outweighs all other factors.
How do morning vs evening workouts affect performance?
Morning vs evening workouts is a question for anyone who wants to optimize their training results. Research consistently shows that physical performance varies considerably throughout the day. Body temperature peaks in the afternoon and early evening, leading to faster muscle contractions, greater flexibility and shorter reaction times. Chtourou and Souissi (2012) analyzed over 50 studies and found that performance in strength exercises is 3–11% higher from 16–20 than in the morning (Chtourou & Souissi, 2012).
Does that mean morning training is pointless? Certainly not. Küüsmaa et al. (2017) conducted a 24-week randomized study and found that regular morning strength and endurance training produced equivalent muscle hypertrophy results to evening training—the difference was primarily in short-term performance, rather than long-term adaptations (Küüsmaa et al., 2017).
Which matters more, training or nutrition—this question is also closely linked to your choice of training time, because nutrient timing affects how much energy you have for your workout.
Which time is more effective for fat burning?
Fat burning is one of the most common arguments in favor of morning training. Fasted morning training increases the use of fatty acids for energy because glycogen stores are lower after an overnight fast. Savikj et al. (2019) found that afternoon training was more effective than morning training at improving blood glucose levels in patients with type 2 diabetes (Savikj et al., 2019)—showing that metabolic effects vary depending on the goal.
In healthy people, studies have shown that calorie balance over the whole day matters more for fat burning than training time itself. The NIH (National Institutes of Health) emphasizes that energy balance—the relationship between calories consumed and calories burned—is the main guiding principle of weight management. Read more about how fat burning and training actually work.
| Aspect | Morning workouts | Evening workouts |
|---|---|---|
| Body temperature | Low—muscles need a longer warm-up | High—optimal performance |
| Fatty acid oxidation | Higher when fasted | Similar with adequate nutrition |
| Strength and endurance | ~3–11% lower | Peak levels in the afternoon |
| Ease of staying consistent | High—fewer distractions | Lower—evening plans get in the way |
| Hormonal environment | Testosterone peaks | Cortisol falls—better recovery |
How does training time affect hormones and sleep?
Testosterone and training are closely linked to the time of day you train. Testosterone levels are naturally highest in the morning, and some studies suggest that morning strength training may take advantage of this anabolic benefit. At the same time, cortisol levels are also high in the morning—the balance between these two hormones determines how favorable the anabolic environment is.
A common myth about evening training and sleep is that vigorous evening exercise disrupts sleep. Stutz et al. (2019) conducted a systematic review and found that moderate to vigorous exercise ending at least an hour before bedtime does not impair sleep quality for most people (Stutz et al., 2019). However, individual responses vary—if you notice sleep problems, move your workout earlier.
What time do experts recommend training?
The general consensus among experts—also supported by the World Health Organization (WHO) in its physical activity guidelines—is that regular training matters far more than the time of day. The WHO recommends at least 150–300 minutes of moderate or 75–150 minutes of vigorous aerobic activity per week for adults, regardless of the time of day.
In practice:
– Choose the morning if your goal is to burn fat while training fasted, if your evening plans are unpredictable, or if you want an energetic start to the day.
– Choose the evening if your goal is maximum strength and performance, if you are short on time in the morning, or if you are naturally a night owl.
Leg press vs. squat—which is better for building bigger legs—training time is particularly important for core exercises like these, as maximal strength is statistically higher in the afternoon.
Ultimately, the best time to train is the time you can stick to week after week. Consistency always beats optimally timed but irregular training.
References
- Chtourou H, Souissi N. (2012). The effect of training at a specific time of day: a review. J Strength Cond Res. 26(7):1984–2005. PMID: 22089134
- Küüsmaa M, et al. (2017). Effects of morning versus evening combined strength and endurance training on physical performance, muscle hypertrophy, and serum hormone concentrations. Appl Physiol Nutr Metab. 42(2):208–215. PMID: 28177714
- Savikj M, et al. (2019). Afternoon exercise is more efficacious than morning exercise at improving blood glucose levels in individuals with type 2 diabetes: a randomised crossover trial. Diabetologia. 62(8):1384–1390. PMID: 30334072
- Stutz J, et al. (2019). Effects of Evening Exercise on Sleep in Healthy Participants: A Systematic Review. Sports Med. 49(2):269–287. PMID: 30374942
Frequently asked questions
Does a fasted morning workout burn more fat?
Fasted training increases fatty acid oxidation during exercise, but studies show that your daily calorie deficit is a more important factor in fat burning than the timing of your workout.
Does evening training disrupt sleep?
According to a systematic review by Stutz et al. (2019), moderate to vigorous exercise that ends at least an hour before bedtime does not impair sleep quality for most people. Individual responses do vary, however.
When is muscle strength greater?
Body temperature and muscle strength peak in the afternoon and early evening. Strength performance can be up to 11% higher than in the morning, but studies show similar long-term muscle hypertrophy outcomes.
Does workout timing affect testosterone levels?
Testosterone levels are naturally highest in the morning. Morning strength training may take advantage of this, but studies show similar long-term muscle growth outcomes for morning and evening training.
What is the best time to work out as a beginner?
As a beginner, the best time is one that fits your schedule and that you can stick to consistently. Consistency matters more than the time of day—even morning training is better than theoretically optimal evening training that rarely happens.
Come work out! ArtGym
