SOUTH PHILADELPHIA (WPVI) -- At Muscle and Flow Massage in South Philly, owner and licensed massage therapist Dorinda O'Donnell tells her clients 'a massage is not just a treat, it's a treatment'.

What Is a Massage Gun? A massage gun is a handheld device that delivers percussive therapy – rapid back-and-forth pressure and vibration – to ease tight muscles. It can also help your muscles prepare ...