StrongFirst and SFG run two of the most respected kettlebell certifications in the US. Roughly three hundred cities have at least one certified coach. Athletes who want technical training in the kettlebell tradition look for SFG II or StrongFirst Elite credentials, not generic personal training certifications.

SleekRank treats each city as a row in src/pages/kettlebell-coaches.json with fields like sfgLevel, strongFirstLevel, certifiedCoaches, and recertCurrent. The urlPattern /kettlebell-coaches/{slug}/ produces pages such as /kettlebell-coaches/seattle/ and /kettlebell-coaches/brooklyn/ directly from the dataset.

When a coach earns a higher SFG level or lets a recert lapse, you edit one row. The rebuild reflows that city's page, refreshes the credential callout, and keeps the rest of the directory cached. The work feels like maintaining a spreadsheet, not editing three hundred WordPress pages.

Kettlebell training in the StrongFirst tradition is a credentialed practice. SFG and StrongFirst certifications require physical testing, technique audits, and recertification every two years. A coach with an active SFG II credential has demonstrated technique on the snatch, swing, and Turkish get-up under examiner scrutiny.

That signal does not exist in generic personal trainer directories. Yelp lists kettlebell-curious personal trainers and SFG II coaches as equivalents. A credential-aware directory closes that gap on day one.

The roster JSON is built from the official StrongFirst and SFG lists, so the credential data is authoritative. Recertification status surfaces who is actively engaged versus who let their credential lapse. Master Instructor and Instructor Trainer status get callouts that match how serious athletes search.

Visitors looking for technical training find the right coaches in their city without having to read a hundred personal trainer profiles. The maintenance story is what makes the directory survive over time.