it has been 5 weeks since I had the spark plug put in as I was diagnosed with 2 degree block. Prior to the operation I was running 50/60 miles a week at 8 min mile pace. I started running again two weeks ago but am really struggling. It feels as if I have not run for years. I am only running 4 miles a day as its all I can manage.
my pace maker has been set at 60, my normal heart rate at rest is 50.
any advice please.