The Firm master instructor Allie Del Rio doles out an invigorating blend of high-energy cardio and body-sculpting exercises -- and, let's face it, a little tough love -- in this core-toning workout that offers options for a variety of fitness levels. Depending on your schedule, you can choose from a complete full-length routine or an abbreviated "express" version, which is great for days when you only have a little time to spare.