The two best are push-ups and bench press. Push ups are great if you vary them as well - doing them with different arm widths, or with elevated hands. Bench press is also good, but the dumbbell bench press is better for your chest than the barbell version.
Simple, repetitive breathing techniques are a good way to expand the chest and exercise the various muscles associated with respiration. Arm circles, push-ups and stretches are also good daily routines.
For fastest results I would suggest butterflies, Front presses, front lateral raises will also give you fast results. If you use free weights the results appear faster, with machines it will take a little longer.
The most popular chest exercise (especially for me) is the bench press. Other good chest exercises are your basic pushups, military press, incline press, flies, dumbell bench press and rows.
Any kind of "fly" is going to be good, a lot of poeple like to do bench press. There is peckdeck, dumbell incline press, decline press, pushups. U can go online and see how to do these exercises if u dont know what they are or if u need examples.
The best exercise for the chest is push-ups. They work the arms, but the pectorals are worked the most. Also, you can lie on your back and put straight out to the sides. Using weights, bring the weights together above your chest and then bring them back down.
Done correctly, push ups can be good chest exercises. Also, pec flies, done with light weights on the floor, can be good for your chest. You can also try lifting small weights straight to the front while standing, one at a time.
Flat Bench Press,Incline Bench Press,Dumbbell flye,Incline Dumbbell flye,Flat Bench Dumbbell Press,Incline Dumbbell Press are some good chest work outs