What’s the Best Time of Day to Train?

What’s the Best Time of Day to Train?

One question that’s raised a lot of doubts after chronobiology became fashionable is: What’s the best time to train? When should I train to get the maximum benefits?

If you’re wonder when the best time to train is with your schedules, stay and we’ll tell you!

What factors influence training times?

The big factor affecting training efficiency depending on the time of day is the arrangement of our circadian rhythms.

It could be said that the circadian rhythms are the structures that hierarchise the functioning of our body according to time and predisposition to sleep-wakefulness, that is, those that establish our schedules.

Let’s say that when sun exposure is greater, our body is more active, as it detects that it’s time to be productive; when night falls, our body decreases its activity as it is time to rest.

Structure of circadian rhythms. Best time to train

Structure of circadian rhythms for a morning chronotype.

This affects factors that condition the quality of our workouts, such as:

  • Body temperature.
  • Neuromuscular activation.
  • The hormones.
Want to know more about circadian rhythms? Visit this link.

Circadian rhythms and body temperature

Body temperature is an important factor as it acts as a catalyst for metabolic efficiency.

Temperature is energy and the increase in body temperature is nothing more than a sign of increased metabolic activity, which results in:

  • Increased energy metabolism.
  • Improved muscle performance: greater power and greater resistance to fatigue.
  • Facilitating the interaction and coupling of actin-myosin (the two myofilaments of the myofibrils that make up the muscle sarcomeres).

Fluctuation of energy expenditure

Fluctuation of energy expenditure within 24 hours.

The peak body temperature is usually reached around 19-21h, although this depends on the specific chronotype of the person, which determines their schedules.

Body temperature fluctuation. Best time to train

Body temperature fluctuation.

Even so, body temperature, and therefore the metabolic efficiency, responds to this pattern, generally, as follows:

  • In the morning: Lower.
  • In the evening: Higher.
  • At night: Lower.

Neuromuscular activation

Neuromuscular activation refers to the efficiency with which our nervous system sends electrical signals to the cells of our muscle tissue, and these respond through a series of biochemical responses to contract.

The peak of neuromuscular activation has been proposed at approximately 6 p.m.

Muscle contraction mechanism

Graphic representation of the mechanism of muscle contraction, from nerve activation to mechanical outcome.

It would correspond to the moment where:

  • The motoneurons innervating the muscle fibres are able to drive a higher discharge frequency and activate at a lower voltage threshold.
  • The myocytes (muscle fibre cells) are able to release and pump calcium into the sarcoplasmic reticulum to free myosin coupling spaces in the actin filaments.
  • The ATPase enzyme activity in myosin globular heads is higher and therefore the cross-bridge coupling is more intense.


Our hormonal activity is optimal within a few hours of waking up.

Hormonal activity responds to these circadian rhythms, according to our schedules.

  • Testosterone: The main androgenic profile anabolic hormone in the body, its maximum concentration is reached at around 9h in the morning.
  • Cortisol: A peak of this glucocorticoid is synthesised first thing in the morning to facilitate the exit of nighttime sleep. It can help get ourselves switched on before workouts.
  • Growth hormone: Its synthesis by the pituitary responds to pulses regulated by circadian rhythms. The most powerful pulse, and the one that responds to the most stable pattern in most people, is the morning pulse.
In most cases, the peak of the hormones of greatest interest is reached in the morning, at approximately 7-9h.

Exercises for the morning

In the morning on an empty stomach, taking into account the criterion of increased hormonal activity, especially in relation to the growth hormone, which has a powerful lipolytic action, together with the partial depletion of hepatic glycogen concentrations.

Growth hormone synthesis. Best time to train

Effects of increased growth hormone synthesis.

It is the best time to train for low and medium intensity aerobic exercices with the aim of maximising fat oxidation.

Exercises for midday

At midday we can do any type of training as we’re in an intermediate period, where body temperature is moderate, as well as other variables of metabolic interest.

Training at midday. Best time to train


It might be the best time of day for long-distance endurance workouts, provided environmental factors such as external temperature and/or humidity don’t adversely affect performance.

Exercises for the afternoon-evening

The afternoon-evening is when our neuromuscular function is at an optimal level and body temperature is higher.

I’d aim to do strength and muscle power workouts at this time of day.

Between 18 and 21h would be the ideal training time for:

  • HIIT.
  • CrossFit®
  • Calisthenics.
  • Bodybuilding.
  • Powerlifting/Weightlifting.

Training in the afternoon

Training in the afternoon.

As it’s the time of day where we can generate more strength and the risk of injury is lower, making it one of the best times to train.

In spite of everything, for practical purposes, the really important thing is to train, and to do sp at a time of day that adapts to our sociodemographic needs.

How long do you have to train for per day?

There is no set training time, and it’ll depend on:

  • The type of activity performed.
  • The training status of the athlete.
  • The athlete’s goals.
  • The type of session performed.
  • The time of the season.

How much to train

And many other training schedule variables that influence session length.

A suitable session duration can last between 40 and 120 minutes, although it can be longer or shorter and equally efficient in each specific case.

Bibliographic references

  1. Bird, S. P., & Tarpenning, K. M. (2004). Influence of Circadian Time Structure on Acute Hormonal Responses to a Single Bout of Heavy-Resistance Exercise in Weight-Trained Men. Chronobiology International, 21(1), 131–146.
  2. Burley, S. D., Whittingham-Dowd, J., Allen, J., Grosset, J. F., & Onambele-Pearson, G. L. (2016). The differential hormonal milieu of morning versus evening may have an impact on muscle Hypertrophic Potential. PLoS ONE, 11(9), e0161500.
  3. Chtourou, H., & Souissi, N. (2012). The effect of training at a specific time of day: A review. Journal of Strength and Conditioning Research, 26(7), 1984–2005.
  4. Hayes, L. D., Bickerstaff, G. F., & Baker, J. S. (2010). Interactions of cortisol, testosterone, and resistance training: Influence of circadian rhythms. Chronobiology International, 27(4), 675–705.
  5. Masri, S., & Sassone-Corsi, P. (2018). The emerging link between cancer, metabolism, and circadian rhythms. Nature Medicine, 24(12), 1795–1803.
  6. Shariat, A., Kargarfard, M., Danaee, M., & Tamrin, S. B. M. (2015). Intensive resistance exercise and circadian salivary testosterone concentrations among young male recreational lifters. Journal of Strength and Conditioning Research, 29(1), 151–158.
  7. Teo, W., Newton, M. J., & McGuigan, M. R. (2011). Circadian rhythms in exercise performance: Implications for hormonal and muscular adaptation. Journal of Sports Science and Medicine, 10(4), 600–606.
  8. Westerterp KR (2019). Control of Energy Expenditure in Humans. In: Feingold KR, Anawalt B, Boyce A, et al., editors. Endotext [Internet]. South Dartmouth (MA): MDText.com, Inc.; 2000-.

Related Entries

  • Another interlinked question is the following: What should you eat before exercising? Our repsonse here.
  • We give you 14 reasons to do weight training in this post.
Review of Best Training Schedule

Circadian rhythms - 100%

Influencing factors - 100%

Hormones - 100%

Times of day - 100%


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About Alfredo Valdés
Alfredo Valdés
He is a specialist in metabolic physiopathology training and in the biomolecular effects of food and physical exercise.
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