Exercises for Rotator Cuff Tendinitis. The rotator cuff is where four groups of tendons form a cap at the top of the humerus bone. This area can become inflamed due to loose joints, overuse or heavy lifting. There are a number of stretching and strength-building exercises that help heal tendinitis in this area. It is best to start slowly and gradually build up strength. Stretching and warming up the rotator cuff area can promote blood flow to the area and enhance the healing process.