Optimal musculoskeletal function requires that an adequate range of motion be maintained at all joints. Maintenance of flexibility in the lower back and hamstrings is of particular importance. Lack of flexibility in these areas may be associated with increased risk of injury and the development of lower back pain. Flexibility is enhanced by the daily performance of dynamic and static stretching exercises. These types of exercises are performed daily during the warm-up and cool-down. Conditioning Drill 1 contains dynamic exercises that challenge the body's range of motion to achieve a variety of postures. The Stretch Drill provides exercises that are designed to improve flexibility in most major muscle groups of the body. These static stretches involve slowly stretching muscles and then holding that position for an extended period of time (20 seconds). Static stretching is most beneficial at the conclusion of a physical training session. Refer to Appendices A and C for specific guidance on performance of Conditioning Drill 1 and The Stretch Drill, respectively.