You can't look strong just by practicing a muscle. You should pay attention to the exercise of chest, back, legs and abdomen at the same time. Back: sitting, sitting rowing, barbell rowing, pull-ups. Chest: bench press, flying birds, elbow flexion, push-ups. Legs: barbell squat, dumbbell lunge squat, leg flexion and extension, weight-bearing heel lift. I have a cycle of three days, one day to carry my chest and legs (abdomen: sit-ups, every day) and three cycles of rest. I practiced for five months, and it should be said that the effect is very good. The important thing is to persist! I wish you success! Also pay attention to rest and nutritional supplements (I also eat protein powder, I am thinner).