Apart from muscle growth and apart from the red face, fast-beating heart, pumping lungs, and sweat, there’s much more going on in your body when you are warming up. And trust me when I say this, the result is so good that you would start loving yourselves more than you can love someone else.

Imagine yourself doing bodybuilding workouts that keep the tendency to get yourself attracted to your body! What else matters?

But what we know are the external results such as turning active gradually and living a longer, healthier, and more productive life. However, who all really knows what happens in BTS? What’s happening in that space inside our body when we squat or pull the bars?

So, we’ve tried asking a few gym experts as well as some real good physiotherapists and tried gisting out the common grounds each one of them meets. So you ready to uncover some unknown facts about your body, or shall I say some mechanisms your body has been upgrading itself into?

– Erin Gray“Once you are exercising regularly, the hardest thing is to stop it.”

Let’s Uncover Some Truth…

1.    Muscles (Muscle Growth)

When working out at the gym, your body is working hard to contract your muscles and create movement. In order to do this, it needs energy in the form of glucose. Glucose is a type of sugar that the body stores away from the foods we eat in the form of glycogen.

During bodybuilding workouts, your body will begin to use up this stored glycogen for energy, leading to muscle growth and weight gain. Additionally, certain exercises are designed specifically to promote muscle development and the evolution of lean muscle mass.

The body requires some extra amount of oxygen to create more ATP when working out. Hence, blood is pumped to the exercising muscles to deliver that additional oxygen. Without enough oxygen, lactic acid will start forming. Lactic acid is flushed from the body within 30 to 60 minutes after finishing a workout. This is why it’s important to warm up before a workout and to take frequent intervals so that your body has the time to recover and produce more oxygen.

While muscle growth is one of the main goals of many gym-goers, there are also various other benefits to regular workouts. These can include increased weight loss, improved cardiovascular health, greater flexibility and range of motion, and better mental health.

2.    Lungs

Why do you think you automatically breathe faster when you are working out? Or maybe trekking? Or perhaps when engaged in any outdoor sports?

The reason is that “your body needs 15 times more oxygen”, by K J Parkins (1) than normal times when you are at rest. When you are working out at the gym, your breathing rate will increase until the muscles surrounding the lungs can’t move any faster. This whole capacity of oxygen use is called VO2 max (Teeraphan Sangkaew, Kasem Pantuso, Chawapong Metheethammawat (2). The higher the VO2 max, the more fit a person is.

So, what happens to your lungs when you are working out at the gym? Your breathing rate increases as you engage in muscle-building workouts or other bodybuilding workouts. This results in increased oxygen being delivered to your muscles, helping them grow and gain weight. Additionally, as your VO2 max increases, your body becomes more efficient at utilizing oxygen, allowing you to strain yourself harder and longer during your workouts.

If you are looking to improve your fitness and build muscle, it is important to focus on workouts that can help increase your VO2 max. This might include exercising at a high intensity for shorter periods, such as doing short cardio intervals or lifting weights with short rest periods in between sets.

3.    Heart

During your workouts to gain weight or lose weight, your heart muscle undergoes some changes. Just like any other muscle in the body, your heart muscle grows stronger with exercise. This increased muscle mass allows your heart to pump more blood with each beat and better circulate oxygen throughout your body.

Your heart rate also increases during workouts. This is because your body requires more oxygen to power your muscle movements, and the increase in muscle mass allows your heart to meet this demand. Additionally, as you continue to exercise over time, your heart muscle becomes more efficient at pumping blood throughout your body.

4.    Brain

As you head to the gym or lace up your running shoes, your brain is busy making changes to prepare for your workout. Increased blood flow brings oxygen and other nutrients to your muscles during bodybuilding workouts, boosting their growth and repair. At the same time, muscle contractions release neurotransmitters that help improve mood and focus. And the benefits of exercise don’t stop when you finish your workout. Regular physical activity can help protect your brain from age-related decline and improve cognitive function.

So what happens to your brain when you are gymming?

During a workout, your brain works hard to keep you motivated. As you start to exercise, increased blood flow brings more oxygen and nutrients to your muscles, helping them grow and repair. At the same time, muscle contractions release neurotransmitters that can help improve mood and focus, making it easier to stay motivated throughout your workout.

Neurotransmitters (type of chemical messengers in the brain that includes endorphins) aren’t just responsible for making us feel good but also play a role in memory and learning (Zachary M. Sheffler; Vamsi Reddy; Leela Sharath Pillarisetty [3])

“When you exercise, you create an environment in your brain that is really conducive to learning and memory,” says James McGaugh, PhD, a neuroscientist (4) at the University of California, Irvine. “You’re more awake, you’re much more alert, and your brain is getting more blood. All of these things help to improve your ability to concentrate.”

5.    Kidneys

When working out intensely, your kidneys go into overdrive to help keep you hydrated. They filter more blood and reabsorb more water, resulting in less urine output. This is their way of helping your body maintain optimal hydration levels.

In addition, when you are lifting weights and growing muscle, your kidneys play an important role in regulating the body’s protein levels. They help filter out excess protein from your bloodstream, which helps prevent a buildup of harmful waste products in your muscles.

So whether you are working hard in the gym or simply trying to stay hydrated throughout the day, it is clear that your kidneys play an essential role in keeping your body functioning optimally.

6.    Adrenal Glands

The body’s adrenal glands are located on the top of your kidneys and produce essential life hormones. These include cortisol, adrenaline, and noradrenaline.

When you exercise, your body releases these hormones into your bloodstream in order to give you the energy and strength you need to work out. Cortisol helps to mobilize energy stores, such as fat and protein, into fuel so that you can power through your gym sessions. Meanwhile, adrenaline and noradrenaline work to increase your heart rate so that blood can be quickly distributed throughout the body for energy use.

If you want to maximize the benefits of your workouts and grow stronger and leaner muscles over time, it’s crucial to attend to your adrenal glands. Make sure you’re consuming a healthy diet that provides the nutrients you need to function properly and rest plentily to recover from the stress of exercise. Your adrenal glands will help you reach your fitness goals with proper care.

7.    Skin

When you are doing a gym workout, your body undergoes many changes in order to build and grow muscles. One of the main things that happen is that blood vessels in your skin dilate, increasing blood flow to the skin and allowing heat to dissipate more easily through the skin and into the air.

Additionally, your metabolism increases, causing you to burn more calories and fat, which can help you achieve your fitness goals. To maximize the benefits of your workout and support muscle growth, it is important to follow the best diet for muscle gain that is high in protein and to make sure you are getting enough rest and recovery time between workouts. With these tips, you can reach your bodybuilding goals quickly and safely.

8.    Joints

Bodybuilding workouts are intense and can put a lot of strain on your joints. The added weight from the training can cause joint pain and damage. It is important to follow a healthy diet and exercise routine to help reduce the risk of joint pain and injury.

Joints work in much the same way, but they have different functions. The joints at your ankles allow you to move smoothly without getting sore or injured. This is because there’s cushioning tissue lining both ends of the bones. Some ligaments attach one bone directly to another, and tendons attach muscle groups to execute their jobs more effectively.

It is important to follow a proper, well-balanced diet that includes plenty of protein and other nutrients essential for muscle growth. You should also warm up properly before each workout and stretch regularly throughout it.


  1. “Effect of exposure to 15% oxygen on breathing patterns and oxygen saturation in infants: interventional study”, KJ Parkins C F Poets, L M O’Brien, V A Stebbens, D P Southall, 1998 March