Since it is a Torah mitzvah to guard one's health and to live as long as we can, it is very important to maintain a healthy lifestyle. We should eat food that is beneficial to our overall health, being mindful of the quality of the food we eat, and of the quantity. Too much of a good thing can be detrimental to our well-being. We need to walk each day. We also need a sufficient amount of sleep to maintain our health.

Encouraging people to maintain a healthy lifestyle is a mitzvah. Encouraging people to eat healthful food is a mitzvah. Encouraging people to walk each day is a mitzvah. Encouraging people to get sufficient sleep is a mitzvah.

My father's teacher, the Chofetz Chaim, would personally extinguish the lamps in his yeshiva at night so his students would get enough sleep. Rabbi Avigdor Miller walked for an hour each day and encouraged others to do the same.