There is no special effect. Although the chest muscle has not been exercised, it is also a big muscle, but it is far less powerful than the quadriceps. It is difficult to exert their strength actively (even without feeling the obvious contraction of the pectoral muscles). It was like this at first.

At most, emphasize the squat posture, don't shrug your shoulders, don't look up, don't lift your waist, and the bar under the bridge will fall at the position of 1cm, such as the head or the back of your head. First, adjust your posture with a small weight. It is inevitable that the front toe of deltoid and triceps brachii can borrow money, but the ratio of their strength to pectoral muscle and other major muscles is always limited. With the gradual increase of weight (if you are 50kg lighter, it will be almost the same), and ultimately you have to rely on your chest muscles.

If it is difficult to find the feeling of active exertion, then it is absolutely impossible for the protagonist to do five sets of bench presses first and then practice the pectoral muscles of birds and butterflies.