I was diagnosed with PMR last January, and I’ve found it has reduced my stamina and capacity for hard exercise. I used to ride many miles on my bike, but now can only tolerate about half the distance and effort before I reach my limits. Walking more than 3+ miles makes me feel worse instead of better. I still have the stamina for daily exercise, but need to accept - for now - new limitations on my physical activities. Still, staying active makes all the difference in how I feel during the day, and how well I can sleep at night.