What is the optimal range of motion for shoulder flexion and how can it be improved?

The optimal range of motion for shoulder flexion is typically between 160-180 degrees. To improve shoulder flexion, you can do stretching exercises targeting the shoulder muscles, such as overhead reaches and wall slides. Strengthening exercises for the shoulder muscles can also help improve flexibility and range of motion. It is important to consult with a healthcare professional or physical therapist before starting any new exercise routine.