The push-up is one of the most dynamic exercises, working various muscles in your upper body and core. However, building strength to be able to do one or more full push-ups is not that easy. I know you see various people post videos and photos, and you are probably like "Why can't I do that?". Well, it takes time and effort.
Before you jump right into it and give up, start with other simpler variations. Trust me, the variations are tough too and put you to work, but they give you the chance to build your strength.
One example of a push-up variation is in the video below. It is pretty much a push-up on your knees. Now, as you do it, try to keep your back straight (not curved in or out much), and lower your chest right between your palms.
It is hard work and you should feel it after a couple of rounds. As you do the variation, also try doing a couple of full push-ups a few times a week. This helps your body slowly build up.
Cheers Eights & Weights!