It called the Pectoral muscles
Actions that increase one's susceptibility to negative health outcomes are impulsive and ill-thought out actions where a person doesn't necessarily think before he or she acts but just does something. This type of behaviors is very detrimental to different positive health-related efforts of people.
body language, has he been acting weird? Agreeing or disagreeing in a joking way, lot of eye contact, complements you, the way he responds to touch (like a hand on his shoulder, holding his hand, ect.), and does he lean forward when your speaking to him despite already sitting close
