By executing correct push-up formation each and every time, you’ll be building actual strength in your triceps, pectorals, deltoids, glutes, and core (amongst other areas). What’s most important is that you focus on quality over quantity. That means cranking out as many proper push-ups as you can and not wasting any time on a single improper push-up. If you perform just five or six correct push-ups before giving up, so be it. The number will climb as you progress.