Start slowly when setting contract goals. The adage "Less is more" applies to fitness training as well.
Strength conditioning should not be done daily, but it should be followed by a day of rest to allow muscles to rebuild. The contract should require strengthening exercises and aerobic activities on select days (It is recommended that training be at least 3 days a week.) A student's contract may call for warm-up and stretching exercises daily; for Mon, Wed, and Fri agree to warm-up, stretching, and strength conditioning; and for Tue, Thur, and Sat an aerobic exercise -- or all activities could be on the same three days.
An aerobic activity can be an individual activity or a game. It is recommended that games be included in your contract. Games are an excellent alternative to distractions such as TV. (If you haven't already thrown-out the TV or severely restricted its use.) Games allow neighborhood children to participate. Games provide a positive social skill development experience.
If you set running/walking/biking/skating as an activity, you should layout a course and provide your student with an inexpensive stopwatch. A community school/park/trail within easy access to your home is ideal. A street or sidewalk can be used, but you should set markers/identify land marks (mail box, etc.) for the desired distance. You can easily do this by position your car at the starting point, clear your trip odometer to zero, and drive the distance desired to the stopping point. It is recommended that a second stopping point be identified for the cool-down.
As you provide students with text books, you also need to provide fitness training equipment. Click here for fitness training equipment requirements.