Bob Harper: Kettlebell Cardio Shred

Certified instructor description: A fat-burning-focused aero/tone interval program led by a “passionate and friendly” trainer. The kettlebell makes the aerobics more intense and the toning more effective (because you have to control the bell’s momentum). Like the ideal personal trainer, Bob emphasizes safety and effectiveness. He begins by explaining the move and demonstrating the correct form. Then, he puts down the kettlebell and focuses on the exerciser (combining friendly motivation with helpful tips on technique). Features a wide range of kettlebell classics — from “halos” and “weaves” to “suitcase swings” and “windmills” (plus some non-kettlebell exercises). Requires a 5 to 20 lb. kettlebell.