Hormones & strength training: How your cycle makes your workout smarter

Reading time: 5 min | Author: Mika

For a long time, strength training was a fairly linear affair: lift weights, count reps, drink protein shakes—done. But anyone who takes a closer look at the female body quickly realizes that something is missing. More specifically: hormones. Not as a disruptive factor, but as a training compass that shows when your body is ready for what.

Below, we have filtered out the most important hormones for you and summarized them in bite-sized pieces of information: When do they occur more frequently in the cycle, what exactly do they do, and why is it worth keeping an eye on them when training?

Important note: Pain, energy levels, and mood swings are very individual. What we describe here are biological processes that typically occur in the body. However, this does not mean that you always have to feel this way.

The most important thing is to listen to your body, especially during your cycle. Nothing should be forced—you should give yourself space to exercise in a way that feels good for you. 😊

Hormones & your cycle – a concise explanation for your training

For many women, strength training has long been more than just lifting weights. It is a way to gain strength, self-confidence, and well-being. What is often underestimated is the role of hormones. The female body functions cyclically, and this is precisely where there is enormous potential for smarter training.

The powerful effects of estrogen are particularly evident in the first half of the cycle, known as the follicular phase [2]. It supports muscle growth, protects muscle fibers, and promotes regeneration. Studies show that estrogen boosts muscle protein synthesis while also improving fat burning. Many women report increased energy, improved training performance, and faster recovery during this phase. [1]. 

But the cycle continues—and with it, hormonal changes. After ovulation, progesterone takes over. It increases core body temperature, lowers insulin sensitivity, and affects how muscles use energy. This can result in faster fatigue and longer recovery times. But don’t worry: that doesn’t mean you have to take a break. It’s just worth adjusting your training a little – with a focus on technique, moderate exertion, and conscious recovery [4]. 

During menopause, when estrogen levels decline, the risk of muscle loss increases. Targeted strength training—possibly combined with hormone therapy—can help maintain muscle mass [3]. 

The role of testosterone in women

Although it occurs only in small amounts in the female body, testosterone has a fairly significant effect: it supports muscle growth by activating what are known as androgen receptors. These receptors are located in the muscle cells and function like tiny “switches” – as soon as testosterone binds to them, a signal is triggered that promotes muscle growth.

Particularly exciting: testosterone works best in combination with other growth hormones such as IGF-1. And although women have significantly less testosterone than men, they achieve similar muscle gains when training. This is precisely because their bodies use other muscle-building processes particularly efficiently [5]. 

Growth hormones and IGF-1 are true adaptation professionals. They promote the repair of muscle damage and balance hormonal differences. And because estrogen stimulates their release, the first half of the cycle is often particularly effective for muscle building and regeneration [1]. 

Calm Down! Cortisol and Exercise

One hormone that is often viewed critically is cortisol—the classic stress hormone. In the short term, it mobilizes energy, but in the long term, it can promote muscle breakdown, inhibit regeneration, and weaken the immune system. Cortisol levels rise permanently, especially during intensive training without sufficient breaks.

It is interesting to note that not only the intensity but also the type of training influences cortisol levels: coordination training, for example, can trigger higher cortisol spikes than cardio training. Cold treatments after training—known as post-workout cooling—can help to dampen the effects of cortisol and accelerate recovery [6]. 

What does all this mean for your training? Quite simply, your cycle is not an obstacle—it is your advantage. Understanding how hormones work allows you to tailor your training to be smarter, more individualized, and more sustainable. You don’t have to work against your body—you can work with it to become stronger.

Here’s a fun fact to finish with, which honestly helped take some of the pressure off me: if your period falls on the day of a competition, it’s no big deal – on the contrary: at the start of your period, you are hormonally “free” – your body knows that you are not pregnant, so your immune system is working at full capacity and inflammation is reduced. Some women even experience a slight boost in performance as a result. Impressive: world record holder Paula Radcliffe ran the fastest marathon in the world in Chicago in 2002 despite menstrual pain. [7]! 

Conclusion: Your cycle is not an obstacle – it is your advantage.

Hormones are not whims of nature, but intelligent regulators that show you when your body is ready for what. Understanding them allows you to make your training smarter, more individual, and more sustainable.

• Estrogen promotes muscle growth and regeneration.

• Progesterone requires more mindfulness and rest.

• Testosterone is effective even in small amounts.

• Growth hormones balance out differences.

• Cortisol shows how important breaks and stress management are.

So: track your cycle, listen to your body, and harness your hormonal superpowers. You don’t have to work against your cycle. You can use it to become stronger.

Sources:

[1] Die Rolle von Hormonen im weiblichen Trainingszyklus – Unifem 

[2] Zyklusbasiertes Training 2025: Aktueller Stand der Forschung und … 

[3] Hormontherapie und Training: Wirkung & Evidenz 

[4] Zyklus als Superpower: Expertin über Training & Ernährung 

[5] FRAUEN & Muskelaufbau: SO WICHTIG ist Testosteron WIRKLICH! – fitpedia 

[6] Was wäre wenn dein Cortisol-Level das Training sabotiert 

[7] ROAR, Stacy T. Sims, S. 20