To treat tennis elbow with physical therapy, begin with gentle stretching of the forearm muscles to reduce tension. Strengthen the extensor muscles through exercises like wrist curls, reverse curls, and grip strengthening with light resistance. Eccentric exercises, where muscles lengthen under tension, are particularly effective. Ice therapy can reduce pain and inflammation after exercises. Gradually increase intensity while avoiding activities that aggravate the condition, focusing on proper technique and ergonomics to prevent recurrence.