Nothing can replace passion when it comes to entrepreneurship. That passion, when combined with the discipline of fitness, gives you two of the most important traits you need to start a business.

When it comes to the modeling industry, fitness models are the cream (or perhaps the protein shake) of the crop—their work requires stringent levels of physical demands. If you want to start working ...

Behind every perfectly tailored “Bridgerton” costume and ad for Lululemon leggings lies the work of fit models, the unsung heroes who help designers create clothes that actually work on real bodies.