If you are feeling lethargic in your body, then close your left nostril with the help of finger and breathe only through right nostril. Do this sequence for one to two minutes. This makes the Sun pulse of our body effective, which causes us to feel energy in the body.
We can do this sequence even after eating food, because of this, the body's stomach's fire becomes effective and the food is easy to digest.
( Source of the pic - fit.thequint .com)