Resume are not require. Best thing to do is contact a physical therapist directly or contact the coordinator in Rehab/Physical Therapy department. Find the contact information on their website. For the most part, if you explain you're a future PT student, looking to shadow... they would understand. I wouldn't ask less than 10 hours when working a schedule. After you are done completing the hours, have a form to document your hours (this form should have the PT name and license number). In addition, ask for a referral to shadow a different department (ex., By a chance, do you know any PTs I can shadow in inpatient Rehab?). Hope this helps.