Everyone becomes sick from time to time. It’s just a part of life. Your immune system becomes weakened by a variety of agents, and allows a cold or flu bug to slip through. In most aspects of life, you can just pause things for several days, and stay in bed, and recover. But in the world of bodybuilding, progress is lost when you fall ill. Much of what bodybuilding entails – extremely hard training and rigorous dieting – actually causes the body to face greater likeliness of becoming sick. You tear down your immune system and central nervous system when training hard and heavy. Bodybuilding makes your muscles stronger but often leaves your immune system weaker.