Lower yourself onto a flat bench with your legs shoulder-width apart and arms straight (more than shoulder width apart). Your neck, back and legs should all be in a straight line.
Lower yourself towards the bench all the way down to your chest. Then, raise your body back up to the starting position and repeat movement for the prescribed number of repetitions.
DO
DON'T
Lower yourself in a controlled manner
Don't do this exercise too fast
SPECIAL NOTES & LEVEL of DIFFICULTY VARIATIONS
If you want to increase the level of difficulty, spread your arms a bit wider or decrease your body's level/angle of incline
This is a simple exercise and somewhat underestimated. It does wonders for the chest muscles and the best thing is that it can be done anywhere.
You can do variations on this exercise by simply doing it with narrow (to target your inner chest muscles) or wide grip (to target outer portions of your pectorals.
One thing to point out is that this exercise is not an exercise that you should base your entire chest workout around. This exercise should be treated as an addition meaning that you will construct your chest workout around more traditional high-yield chest exercises and you will simply do this exercise as a 3rd or 4th exercise. As good as this exercise is, it is by no means a substitute for the big daddy of chest exercises - the traditional bench press!