Hi will you be safe and are you able to workout and do sports with a mitral valve leak (basketball) i am a 16 year old athlete and recently found out i had this , doctor said it was fine and normal but i just wanna double check and make sure im ok?

The "leak" appears to be minimal, or your doc would have said so. The normal physical activity and workouts for high school age kids are well known by the doctors and they would have restricted you if it was an issue. When you post on this site the more detail you provide the better. Here the amount of leakage would be helpful, but your docs affirmation you were okay is enough.

A cardiac condition is present and should be evaluated by your Pediatric Cardiologist. If they clear you for your team, then you may resume play. Watch for signs of shortness of breath and dizziness. Stay well hydrated during the game.