I was in a bike accident and (I think I) bruised my sternum. The pain was very intense at first and hurt to breathe deeply, rotate my torso and lay down. It has been a week and a half and the pain is a lot less severe but it still hurts a lot when I cough, sneeze, lift anything heavy or lay down in some positions. I realize it might take several weeks to heal completely but I want to know if it is still safe to go cycling with moderate/heavy breathing. I don't want to do anything that will worsen it.