Final answer:
During overhead exercises, it is important to maintain a slight arch in the lumbar spine to ensure a neutral position. This helps to distribute load evenly and minimize the risk of strain or injury.
Step-by-step explanation:
A neutral lumbar spine is desirable during overhead exercises, requiring it to maintain a slight arch. The lumbar region of the vertebral column allows for considerable extension, flexion, and lateral flexion, but the orientation of the articular processes largely prohibits rotation. Maintaining a slight arch in the lumbar spine helps to distribute the load evenly and minimize the risk of strain or injury during overhead exercises.