It was after starting mountain biking that I developed arrhythmias. I think that sport is unique in that we push those last few pedal strokes to make it up a hill...otherwise, you are off the bike and walking. So push we do!! That "redlining" combined with nighttime bradycardia (resting heart rate sometimes as low as 41) is what pushed my poor little heart too hard. Any similar experiences? How about post ablation? Anyone still riding? I have been doing a lot of shuttling up to the top and riding essentially all downhill!