Push-ups are an effective and efficient way to build muscles in our upper body, trains all upper form of body muscles like arms, back, Shoulders and chests. When you become experienced enough, you can use an improved form of push-ups by leaning on the wall, on the kitchen's door, or wherever to do the push-up at an angle. As you grow stronger you may be able to work your way to using the floor as your starting point. Push-ups also help to increase your muscles along the triceps and biceps, i.e. your arm muscles as this exercise uses our entire body as the weight.