[philipwhiuk]

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.

[dlivingston]

Former Crossfitter. HIIT routines are prominent in CrossFit but it is more than just that.

CrossFit is functional fitness, meaning the goal is to build a broad foundation of athleticism - strength, speed, agility, endurance.

So, while HIIT is prominent in the WOD (workout of the day), so are Olympic lifts, running, climbing, and mobility.