(1) Nutritious Foods: Consumption of ready-made food items like bread, biscuits, sweets, fast-foods, soft-drinks, etc. diminish the Life Energy (vital force) whereas the natural foods such as fruits, vegetables, cow-milk etc. when taken in appropriate quantities according to the prevailing season increase the Life Energy. One who takes his meals between 9:00 am to 11:00 am and between 5:00 pm to 7:00 pm develops his Life energy.
(2) Physical Exercise & Pranayama: During the Brahma Muhurta (From two and a quarter hours before dawn to sunrise) the winds from all quarters are absolutely free from all types of impurities. Hence walking in open air, running and deep breathing etc. are extremely salubrious for health. Practice of pranayama particularly between 4:00 a.m. to 5:00 a.m. increases the vital force.
(3) Continence: Celibacy is destroyed by having friendship with members of opposite sex. The boys who befriend girls and girls who befriend boys cause a great loss to their vital force. Girls should make friends with the girls and boys with the boys alone; this helps strengthen their vital force. One should be righteous in conduct and practice Brahmacharya. Moreover, one should also have a perfect control of the speech and the palate or tongue. That means one should not be a glutton and garrulous in speech.