What kind of exercise that can harden my chest?

Question

What kind of exercise that can harden my chest?

Answer 1

Push-ups are very good. But most people think of the simple ones, but there are many different types of push-ups that work different parts of your upper body. Wide, Regular, Diamond, Feet elevated, one-handed, all of these work different parts of the chest/arms. And you will find yourself using muscles you didn't even know you had.  

Answer 2

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Answer 3

pushups.. bench press... deep dips... swimming.... rowing ...

there are half a dozen machines dedicated to chest at the gym.. plus cable amchines etc.