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The fashion consultant, who is squeezing in a session before work, lifts relatively light weights while doing simple movements to build strength: goblet squats with a 6-pound kettlebell, then bicep curls with a 10-pound weight.

The exercises competitors are put through are 1km on a standing ski machine, 50m of sled push, 50m sled pull, 80m burpee jumps, 1km indoor rowing, carrying a kettlebell 200m, 100m lunges carrying a sandbag, and finally 100 throws and catches of a medicine ball off a wall.

Half the people down here look like they’re itching to tell you all about how CrossFit changed their lives, and the other half seem too strung-out to even contemplate lifting a kettlebell.

In September, Time photographed Mr. Johnson in his private gym, naked but for a carefully positioned kettlebell — an instant meme.

Mr. Tang, the organizer, carried along a cardboard cutout of Mr. Johnson’s famous kettlebell photo.