Stamina Improving

While I’m only in my 40s, I was diagnosed with a rare disease.  My stamina has been declining for a long time along with muscle issues.  I noticed after a few Body Code sessions that my stamina to “work” has gone from about 4 hours to being able to work all day and into evening.  Another benefit is fewer muscle problems.  Do I still have the disease?  Yes, but it is much less severe.