What’s your resting heart rate?

So this might be a little long to explain but I used to weigh 390 pounds. I decided to have weight loss surgery and have since lost about 150 pounds. All good right? I exercise and run regularly 4-5 days a week and never have any issues. Yesterday I went to my doctor and while checking my vitals he noticed my resting heart rate was around 40. He seemed very concerned and immediately ordered an ekg to be done. Well now I’m a little concerned and worried but the ekg comes back as “sinus bradycardia” which I was told was a “normal but slow heart rate” I asked if since I’ve been running a lot for a few months and before that a very active person at the gym that it could be normal. He said it could be. He also said that in my last 4-5 visits my heart rate has gone down each time. When I was my heaviest he said it was in the 90’s then the 70’s then 55 and now in the 40’s which I kind of thought was a good thing. I still weight 240lbs but I have no issues or symptoms of heart issues. He said he would just keep an eye on it and that I didn’t need to see a cardiologist yet. Anyone else have a low heart rate but no symptoms or issues or anything? I thought a low heart rate was a good thing…