“This workout will be tough no matter what,” she says. “The classic 21-15-9 CrossFit rep scheme is always a mental challenge, with the set of 15 typically the trickiest part.

Touted as a quick, effective, and accessible exercise routine, the “7-minute workout” has been a viral favorite for over a decade. But there’s more to it than meets the eye.

What does the CrossFit 23.3 workout entail? Well, you can bet it's *extra* challenging. Here's what to know — and how you can modify it.