This 20-minute workout from Class FitSugar is led by Trainer Yumi Lee, co-owner of Reebok CrossFit Lab. There are five moves: kettlebell deadlifts, goblet squats, Russian swings, around-the-worlds, and American swings. The difference between a Russian and an American swing is that in the former you're only swinging to eye-level, whereas in the latter you're swinging above head.