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The Hidden Engine: The Power of Knee Work in Jiu-Jitsu by Jay Zeballos

The Hidden Engine: The Power of Knee Work in Jiu-Jitsu by Jay Zeballos

by Jay Zeballos

$99.00

Everybody talks about the hips, but the knees are the second engine of jiu-jitsu, and few people understand how to put them to work better than Jay Zeballos.

$99.00
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It's a mess, I know.

My goal is to build the most comprehensive BJJ encyclopedia anywhere — but good, accurate data is genuinely hard to come by. Records, gyms, belts and nationalities are pieced together from public and community sources, so some of it is incomplete, outdated, or flat-out wrong.

That's where you come in. If you spot something off, tell me and I'll fix it — every correction makes this better for everyone. This website wouldn't be possible without the community.