This stuff comes in waves and every generation thinks that it's unique. Adidas was originally a pro fitness brand like Gymshark is now. Gymshark will become athleisure just like Adidas, it's just a matter of time.

Crossfit is just the name for HIIT training that's pumped as a new branded workout. Note that already it's now Hyrox. It will be something else in a few years.