Push-ups might a big hard for the beginners. In many gyms there are such exercise machines that can help to begin with. It's for pull-ups, but it also helps your chest to work
Also a tip for the beginners - girls should do more short sets and less pauses in between, guys should do longer sets combined with long pauses in between
It's a sign, I definetely need to try it.
I would say it's effective!