5 Things That’ll Happen To Your Body During Your First Week At The Gym

Embarking on a new workout routine can be an exciting and transformative journey. Whether you’re a fitness enthusiast or just starting to incorporate exercise into your daily routine, the first week at the gym can be a crucial period that sets the tone for your fitness journey.

During this initial phase, your body undergoes several changes as it adapts to the demands of physical activity. In this article, we will explore five key things that happen to your body during the first week at the gym.

1. Increased Muscle Soreness and Fatigue

During the first week at the gym, your body will feel fatigue very much and your muscles will be sore.

During the initial days of working out at the gym, you may experience increased muscle soreness and fatigue. This is commonly known as delayed onset muscle soreness (DOMS) and is a result of micro-tears in your muscle fibers caused by the physical stress of exercise.

As your body adjusts to the new demands, you may notice discomfort and stiffness in the targeted muscle groups. This soreness usually peaks within 24 to 48 hours after your workout and gradually subsides as your muscles repair and adapt to the exercise stimulus.

2. Elevated Heart Rate and Breathing

During the first week at the gym, your heart rate will elevate more quickly, and your breathing will deeper and more rapid during your workout.

Engaging in regular physical activity stimulates your cardiovascular system, leading to an increase in heart rate and breathing. During the first week of your workout routine, you may notice that your heart rate elevates more quickly and your breathing becomes deeper and more rapid during exercise.

This is a positive sign that your body adapts to the increased demand for oxygen and nutrients by delivering them more efficiently to your muscles. Over time, with consistent training, your cardiovascular system becomes stronger, and your heart rate and breathing normalize during exercise.

3. Improved Mood and Mental Well-being

During the first week at the gym, you will have an improved mood and sense of good well-being.

Exercise is not only beneficial for your physical health but also plays a crucial role in improving your mental well-being. When you start to go to the gym, you may experience an immediate mood boost. Physical activity stimulates the release of endorphins, which are natural chemicals in the brain that enhance feelings of happiness and reduce stress and anxiety.

Additionally, exercise promotes the production of neurotransmitters like serotonin and dopamine, which are associated with improved mood and overall mental wellness. These positive effects can be experienced even in the first week of going to the gym.

4. Increased Energy Levels

During the first week at the gym, your body will feel more energized than ever due to an increase of oxygen in your body.

Contrary to what one might expect, going to the gym can increase your energy levels. While the initial physical exertion may leave you feeling tired, regular exercise improves your body’s overall energy production and utilization systems.

As you engage in physical activity, your body adapts by increasing the efficiency of oxygen delivery and enhancing the function of mitochondria, which are the powerhouses of your cells responsible for producing energy. This adaptation leads to increased energy levels, allowing you to feel more invigorated and alert throughout the day.

5. Changes in Body Composition

During the first week of starting a new workout routine, your body will feel different. Your metabolism will also change.

Another significant change that occurs during the first week of going to the gym is the initial shift in body composition. While it is unrealistic to expect dramatic weight loss or muscle gain within just one week, you may notice subtle changes in your body.

Exercise stimulates the metabolism, leading to an increase in calorie expenditure even after the workout is complete. This, combined with a balanced diet, can gradually decrease body fat over time. Additionally, as you engage in resistance training, your muscles may become more toned and defined, albeit in the early stages of your fitness journey.


Going to the gym can be a transformative experience for both your body and mind. The first week is a crucial period during which your body adapts to the demands of exercise. You may experience muscle soreness, increased heart rate and breathing, improved mood and mental well-being, increased energy levels, and subtle changes in body composition.

Also Read: How Often Should You Work Out Per Week?

Remember, consistency is key to achieving long-term fitness goals. Embrace these initial changes and keep pushing forward on your fitness journey.


  1. Chen, T. C. (2003). Sports Medicine for the Primary Care Physician. Boca Raton: CRC Press.
  2. Ströhle, A. (2009). Physical activity, exercise, depression, and anxiety disorders. Journal of Neural Transmission, 116(6), 777–784.
  3. Dishman, R. K., O’Connor, P. J., & Washburn, R. A. (2015). Physical activity and public health: Updated recommendation for adults from the American College of Sports Medicine and the American Heart Association. Medicine and Science in Sports and Exercise, 47(3), 622- 627.
  4. Puetz, T. W. (2006). Physical activity and feelings of energy and fatigue: Epidemiological evidence. Sports Medicine, 36(9), 767–780.
  5. Donnelly, J. E., Blair, S. N., Jakicic, J. M., Manore, M. M., Rankin, J. W., & Smith, B. K. (2009). American College of Sports Medicine Position Stand. Appropriate physical activity intervention strategies for weight loss and prevention of weight regain for adults. Medicine and Science in Sports and Exercise, 41(2), 459-471.

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