Technique, technique, technique! The push-up is the most classic gym exercise that everyone knows about, but not all people know how to do very well. Trainers will tell you it's better to do 10 good push-ups than 50 bad ones. Like many things in life, quality is far more important than quantity when doing this staple workout. For photos and videos on how to do a correct push-up, and variations to add a bit more of a challenge, click here.