Yes, there does seem to be relationship between moderate exercise and increased PMR symptoms with lower doses of prednisone. I guess the explanation is that exercise causes inflammation. I started on 20 mg of prednisone in August of 2021. I had gone 4 months without a diagnosis and had backed my activity level way off due to pain. Suddenly I could do whatever I wanted again: 8-9 mile hikes with 1500 feet of elevation gain, bike rides up steep hills, birding carrying a telescope and gear 3-4 miles. There was no pain and no after-effects. This was true until I got below 10 mg when I began to have increased symptoms with activity. Below 8 mg I really ran into trouble. My rheumatologist told me to hold on 8 mg for awhile. I'm continuing my preferred activities but not hiking and walking as far and slowing everything down. I feel that I need to do this to continue the taper. I am taking a trip next month and will not drop my dose until I get back. If you are like me, 15 mg will allow you to really enjoy your trip!