Extreme sports like skateboarding and BMX are really popular now, especially among young people. They weren't around 50 years ago. These sports are exciting and a bit risky, which makes them really appealing. Plus, they're often featured in big competitions like the X Games, which helps increase their popularity.

E-sports have become incredibly popular recently. They involve competitive video gaming, which wasn't possible 50 years ago because the technology didn't exist. Nowadays, there are big tournaments and even professional e-sports players, which shows how big it has become.

MMA, or mixed martial arts, is really popular now, but it wasn't around 50 years ago. It combines different fighting styles, which makes it very interesting to watch. Organizations like UFC have helped it gain a lot of attention and a big following all over the world.