I know that my condition has improved since I began meditating. My muscles are not stronger, but my endurance is much better. Part of it is because I am more mindful of the movement of my body, which results in me being more aware of when it is time to stop and rest. I also found it easy to change my diet, reducing sugar and alcohol with little effort – a miracle of sorts.
In his article on meditation and your immune system, Deepak Chopra mentions a study which showed that meditation may have actually reduced the pro-inflammatory gene expression in my muscles. It also explains why I rarely get sick. I learn something new everyday!