This post offers a collection of my favourite band exercises for improving shoulder mobility and stability.
If you've dislocated a shoulder in the past, please be conservative with any exercises you try, and after clearing things with your physician, you might start with those that have your arms no higher than chest level. Over time, as your shoulders feel stronger and more mobile, you can gradually work your arms overhead. Read more about A Collection of Band Exercises to Improve Shoulder Mobility and Stability
For those looking to overcome chronic back pain and stiffness, it's helpful to alternate between core-strengthening and spinal mobility exercises. This video provides examples of how to alternate between variations of these two types of exercises.
For more ideas on core-strengthening exercises, please see:
How to Foam Roll Your Lower Legs - Gastrocnemius, Soleus, Flexor Hallucis Longus, Tibialis Anterior, Peroneus Longus, Brevis, and Tertius, and Soles of Feet:
90/90 hip mobility work is highly effective for improving functional range of motion of your hip joints.
Before beginning 90/90 work, I suggest warming up your spine, particularly your lower spine, as sitting in the 90/90 position can put some strain on your spine and surrounding soft tissues, and thoroughly warming up your back will decrease risk of straining muscles and ligaments in and around your spine. Read more about An Introduction to 90/90 Hip Mobility Exercises
If doing full body weight dips or push-ups close to the ground aren't possible for your current circumstances but you are still curious about using gym rings to improve your upper body and core strength, you can do modified push-ups on your rings as you are leaning slightly forward. Read more about Standing Push-ups Using Gym Rings for Upper Body Mobility and Core Strength
Doing push-ups with gymnastics rings is a challenging way to improve upper body strength while simultaneously improve core strength and balance.
Begin in a modified push-up position with your knees on the ground and your hands on gym rings.
At the top of the push-up position, with your arms straight, elbows locked, supinate your forearms, then allow your forearms to return to a natural position and lower yourself down to do a push-up. Read more about Push-Up Progressions Using Gymnastics Rings
If you dilute yourself trying to please everyone, you won't have anything substantial or powerful to offer anyone, including yourself. Be selective about where you choose to focus your energy.