Elder Jörg Klebingat of the Seventy said, "Your soul consists of your body and spirit (see D&C 88:15). Feeding the spirit while neglecting the body, which is a temple, usually leads to spiritual dissonance and lowered self-esteem. If you are out of shape, if you are uncomfortable in your own body and can do something about it, then do it! Elder Russell M. Nelson has taught that we should “regard our body as a temple of our very own” and that we should “control our diet and exercise for physical fitness” (“We Are Children of God,” Ensign, Nov. 1998, 87; Liahona, Jan. 1999, 103).
President Boyd K. Packer has taught “that our spirit and our body are combined in such a way that our body becomes an instrument of our mind and the foundation of our character” (“The Instrument of Your Mind and the Foundation of Your Character” [Church Educational System fireside, Feb. 2, 2003], 2; speeches.byu.edu). Therefore, please use good judgment in what and especially how much you eat, and regularly give your body the exercise it needs and deserves. If you are physically able, decide today to be the master of your own house and begin a regular, long-term exercise program, suited to your abilities, combined with a healthier diet. Spiritual confidence increases when your spirit, with the help of the Savior, is truly in charge of your natural man or woman."
To learn more: Approaching the Throne of God With Confidence