Answer:
Strengthening the muscles that support your shoulder will help keep your shoulder joint stable. Keeping these muscles strong can relieve shoulder pain and prevent further injury. Flexibility: Stretching the muscles that you strengthen is important for restoring range of motion and preventing injury.
Explanation:
Check the attachment. It seems something is wrong.
Superlatives are verbs that show degree, examples are good, better, best OR bad, worst, worse.
Because there are three or more being compared you want BEST so that answer is most skillfully.