Of course yes! you can go naked above your waist and you won't be punished for that unless you have been too careless about your body and some basic manscaping. Some exercises are best done shirtless, and men do go topless in the gym when they start sweating and smelling bad! But this is not the only time you can go shirtless. Go shirtless when you feel like showing off and when your hard work seems to have borne fruit.