The thymus gland is a specialized organ of the human immune system. It is also one of the most important glands in the human body. Unfortunately, it starts to shrink and become less active after puberty. This can result in a weaker immune system, opening doors for infections and allergies, and contributing to fatigue. One way to activate the thymus, strengthen the immune system, and gain more energy is to tap the area where your thymus is located, which is the upper chest, directly behind your sternum and between your lungs. Continue tapping (light touch), until the area is a bit tender. Don’t forget to breathe!