This is a brief article I wrote on being Spiritually "Fit" a long (long) time ago. Maybe I will use it for my Youth Group.
Becoming spiritually fit demands much time, effort, and exertion. Think about the person who wants to be physically fit. He or she will start with his or her first trip to the gym. For anyone who’s ever vowed to “get in shape,” the first workout is definitely not an easy one. Especially if one’s life beforehand consisted of little or no exercise and plenty of junk food. The first workout can be compared to the first time a person begins his prayer “workout,” the beginning of a new spiritual life. Just like the physical workout, the spiritual workout is not an easy one. It may feel awkward, especially if those spiritual muscles have been dormant for a while. The words may seem stilted and unnatural. Don’t despair. One doesn’t expect to run a marathon after one workout, neither should you expect yourself to be a pro-pray-er. Praying will feel uncomfortable at first, but over time you will improve your prayer skills and you no longer will be trying to control your prayer but the Holy Spirit will be guiding you in prayer. Just like your body adjusts to the workouts, your soul will adjust to the increased spiritually you hope to gain by avid praying. After a while your body needs a workout everyday, and your soul will need to pray. It will become a non-negotiable fact. MTV and other spiritual junk food will no longer be acceptable to your soul, it will reject it. But be careful, just like the body can revert back to its unhealthy shape, so can the soul.