1. The ambient temperature is too low. If the air conditioner in your gym is too low or the indoor temperature is low, then your body will not generate enough heat, so you won't sweat. You can try to raise the indoor temperature or wear thicker clothes to stimulate sweating.
Your body has adapted to exercise. If you exercise regularly, your body will gradually adapt to it and stop sweating a lot. This shows that your body is healthy, adapt to high-intensity exercise, and need more stimulation to sweat.
3. Your body is short of water. If your body is short of water, you can't exert the sweat produced during high-intensity activities. In order to keep your body level, please drink water in time before and after fitness and keep good drinking habits.
4. Your body lacks nutrition. The body may not give full play to the effect of exercise because of insufficient nutrition intake. If you can't produce enough sweat, please consider adjusting your eating habits, including increasing protein and carbohydrate intake, so as to improve your physical fitness and endurance.
In short, not sweating does not necessarily mean that there is something wrong with your body. It may be caused by natural physiological reaction or environment. By strengthening fitness, keeping the balance between water and nutrition, and adjusting indoor temperature, we can try to stimulate the production of sweat. If the problem still exists, you can consult a professional fitness coach, doctor or nutritionist for support.