I had a Saint Jude PM installed about two months ago. I am very active (69 Years Old) and do about an hour of cardio on the elliptical or treadmill 6 days a week. I also do some light weightlifting four of the six days. My heart rate used to be 48-50 is now set at 60. I do have some anxiety from the procedure and get the jitters when I am resting, and the PM wants me at 60 beats. I am getting ready for my first adjustment in the next ten days.