For pecs that beg to go shirtless, start with a bench press. Lie back, with your feet flat on the floor. Hold a dumbbell in each hand at chest level. Push the weights straight up, and slowly lower back down. Start with light weights, doing 16-20 reps until you perfect your form. Go heavier slowly, so you can't do more than 8-12 reps. Aim for three sets, resting 30-90 seconds between sets.