Inspired by the notion of "your core", evocative of much imagery, although descriptive of very little. What this class does focus on is the relationship between your inner-legs, pelvic floor, hip-flexors and abdominal center. It's like other core classes, but a bit longer and a bit more creative. Use a few of yoga's basic poses like crow, plank and chair to target these muscles in a new way. Try it out, it's pretty good (if contrarian).