First of all, stopping exercise may reduce your blood volume, reduce your cardiopulmonary function, and cause you to feel tired and weak in your daily life. In addition, stopping exercise may cause your muscles to gradually atrophy, your body function and metabolic rate to decline, and you will gain weight, especially after stopping exercise, if your eating habits are not adjusted accordingly.
However, because you exercise in the gym for a relatively short time, these effects may not be very significant. If you just stop exercising temporarily, as long as you gradually resume exercising when you start again, your body should be able to adapt to and restore its original health.
In short, even if you stop exercising for a period of time, you are advised to keep proper physical activities, such as walking, jogging or doing some simple indoor exercises, so as to maintain your health and adaptability.