April 24, 2026, 2:29 pm | Read time: 3 minutes
Not only does nature awaken to new life in spring, but our bodies also switch to a different mode. From a biological perspective, spring is the ideal phase for building muscle. With more sunlight and increased vitamin D production, our bodies optimize hormone balance. This accelerates recovery and noticeably boosts energy levels. So be sure to take advantage of this to really challenge your muscles now. The starting signal for the summer body project has been given!
Why You Should Train Your Muscles in Spring
While the body has to fight hormonal sluggishness during training in winter, it is active and capable in spring. Hormones play a major role. They are clearly on our side this season and ready to help us achieve fitness goals. This also applies to muscle building.
Hormonal Changes in Spring
With increased sunlight in spring, the body begins to produce more serotonin. The hormone serotonin has a mood-lifting effect and dispels the lethargy of winter. Many people feel the urge to move in spring, and the barrier to starting exercise decreases.
Additionally, the bright light leads to increased production of the hormone dopamine, which stimulates the reward system and enhances concentration and motivation for training. As serotonin and dopamine production rise, the production of the hormone melatonin decreases. The decline of the so-called sleep hormone reduces morning and everyday fatigue, which also positively affects motivation and performance.
The UV-B radiation, which we receive more of in spring than in winter, also increases vitamin D levels. Studies show that a good supply of vitamin D effectively supports muscle strength and muscle building while reducing the risk of injury.1
Relief for the Cardiovascular System Through Ideal Temperature
Spring not only has an advantage over winter. The moderate climate in spring is much gentler on the cardiovascular system than the summer heat. Since the body has to expend less energy on thermoregulation, its resources are more available for physical performance.
Plenty of Time for Muscle Building
Those who want to prepare visually for a summer body still have plenty of time in spring. An adequate intake of proteins, carbohydrates, and omega-3 fatty acids, along with regular strength training of at least two to three sessions per week, is enough to effectively stimulate muscle growth and achieve maximum training success by summer.
