Please consult your doctor before starting an exercise routine
You can do wall walking (or wall climbing) several ways, exercising one or both arms at a time. The different angles work your rotator cuff muscles in different directions, increasing your range of motion.
Climbing the Front Wall - Facing the Wall
Repeat the Front Wall Climb 3 to 5 times. Your goal is to be able to raise your arms overhead as far as possible.
Climbing the Side Wall - Side to the Wall
Repeat the Side Wall Climb 3 to 5 times with each arm. This helps work your shoulder joint and upper arm muscles for greater flexibility.
After breast or shoulder surgery, your chest muscles may feel tight and rigid. One way to get those muscles moving again is by doing some corner push-ups. If you don't have a corner with enough clear wall and floor space to use, find an open doorway to use instead. The idea is to use your body's own weight to passively exercise those chest muscles.
Repeat this exercise three times, and then take a rest break. Be sure not to bend your spine or scoot your arms along the wall while doing the corner push-ups. If you can't lean into the corner very far, that's OK - just do what you can. Move gently and smoothly. Stop if you feel pain. Over time, you will be able to increase your range of motion.
For the towel stretch, you'll need a long soft bath towel. During this exercise you will use one arm to passively exercise the other. Do not bend forward, twist your body, or stretch to the point of pain. Your goal is to loosen up your affected shoulder, so you can reach the middle of your upper back.
Do the towel stretch 3 times, then switch arms. Stretch your other arm 3 times. Perform the towel stretch twice a day. If you don't see improvement right away, don't worry - shoulder rotation can take several weeks to restore
There are many other exercises that can help you regain good range of motion in your arm, shoulder, and chest muscles. If you need help learning these exercises or want professional guidance, find a good therapist. The disciplines of Pilates, physical therapy, sports medicine, and orthopedics can be of great help.