I can give plenty of examples of the work in poker, but they only come to mind if you're not a casual player. If you're serious about making poker your career, then there are plenty of aspects of the game and its environments which will require work.

Poker is a game that relies equally heavily on mathematical skills and social skills. Those traits don't typically manifest in synch in one person. So unless you're a god of both math and people skills, you're going to be facing some hard work when it comes to forcing yourself to be good at something that you aren't really a huge fan of.

However for the casual player, you don't need to be really excellent at either math or people skills. You can take a purely intuitive approach to ranges and bet strategies and still be a winner at the bottom stakes. A hobby that actually makes money is a nice life hack.