Supermodel Cindy Crawford recruits her longtime personal trainer, Radu Teodorescu, for another cross-training workout that embraces simple movements such as lunges, leg lifts and arm circles for results that really show. Eschewing complicated aerobics choreography, this tried-and-tested routine works every part of the body -- including your thighs, biceps, buttocks, abs and back -- and keeps things moving along with maximum variety.