Good physical health is a prerequisite for missionary service at any age. Below are articles that deal with preparing physically for a mission, as well as maintaining good health while serving in the mission field.

"Health and the Missionary,” Ensign, Feb. 1991, 34–37

"The risk of illness has long been a problem for missionaries who serve in less-developed areas of the world. But over the past three years, there has been a significant drop in missionary illness—the result of work done by the Medical Advisory Committee, a group who advises the Church Missionary Department and the mission presidents around the world."

S. Brent Scharman, "Preparing Your Future Missionary,” Ensign, Oct. 2004, 17–21

"The most important preparation for a mission is spiritual. But parents can help their children be emotionally and physically prepared to serve as well."