Yeah I have one as well and it's caused from access blood flow unnatural to your valves that actually grow the heart in order to support the blood to that area, just like arms, chest, back growing. I was told mine was from sports as well but I was also 273 lbs at the time and using. Arnold had about 5 triple by pass surgery's from enlarged heart conditions and Im guessing it wasnt from running for Gov. of Cali if you know what I mean. It's important to always get regular blood tests and any regular check ups if your going to use AAS, I think people over look that. And some people just like lifting and juicing plain and simple, well they have to have some image in their head of why they are doing it, it's not like they are watering the lawn bro. Im saying all that hard work in my opinion with no goals, plans, or reason other than getting compliments from other people and being jacked gotta get boring and thats why you see guys that have money to get AAS got to the gym and soon as they get off of juice or get bored with it are nowhere to be found. I have to train, I really dont want to but it's 2 totally different types of training.