Do not over-exercise. Yes, you can exercise too much. Overtraining stresses the body and is more common in weight training. After about 45 to 60 minutes of weight training cortisol levels rise dramatically. Weight training sessions should be intense, but brief. To avoid overtraining you should match the intensity and length or your weight training sessions to your ability to recover. Some people are able to recover much faster from exercise than others. For example, mesomorphs tend to recover rather quickly from their workouts, while ectomorphs require a much longer period of recovery.
Avoid crash diets/ very low calorie diets, especially for extended periods, as it stresses the body and increases cortisol. Very low calorie diets can also trigger the body’s starvation response, which slows down metabolism and causes the body to hold onto fat reserves more tightly.