Mobitz type 1 and exercise. I have recently been diagnosed with mobitz type 1 heart block (2nd degree AV block type 1). I am 35 years old and a trained athlete (life time cyclist / runner / weights, last 1.5 years crossfit high intensity short duration workouts). My symptoms were dizziness and irregular heart beat at rest, dropping every 3rd or 4th qrs. I was evaluated and diagnosed with mobitz I by ekg. Echo and cardiac enzymes are normal and there are no other concerns. Resting heart rate around 50 bpm and bp 120/80. No drugs except for occasional celebrex (200mg as needed, only a couple doses per month) and betabocker (used to use atenelol blood pressure but stopped about 1 hear ago), also moderate caffiene and alchol. I was evaluated by a cardiac electrophysiologist and he indicated that the condition was benign and would not progress to any other conditions (like more advanced heart block or other). He also indicated (which seemed contradictory) that because I was symptomatic I should reduce exercise duration and intensity (I only do crossfit 4-5 x per week for 30 minutes and cycle 1-2 times per week for 1 hour). Why if the condition is benign should I reduce exercise.. He did say something about the heart rewiring and causing fibrosis and scaring from the condition but this does not sound like something that is benign to me. I also was unable to find any documentation or reports of this (but obviously I am not a dr...) Can I continue my high intensity and endurance work outs? Do I have risk of this progressing to something worse like fibrosis or other heart issues? Exercise is very important to me and the high intensity specifically has kept my blood pressure and lipids healthy (as well as mental health!). Is there other ways to control this issue? Is there an increase risk of mortality or adverse cardiac events from this condition ( I have seen reports that this is so... again does not seem so benign) please advise..