When Sheila Kelley slid down a stripper's pole in Dancing at the Blue Iguana, something occurred to her: This is hard work. Sensing there was more to the job than stilettos and dollar tips, the L.A.

When Hollywood's A-list needs to learn to pole dance, they almost exclusively head to S Factor. The reason is simple: Founder and actress Sheila Kelley spawned the "sexy fitness" trend after playing a ...