Amy Bento: Advanced Step Challenge 4 - Amy and the team return for another round of advanced stepping fun. This 81 minute, steady state step workout consists of four advanced step combinations. There is an extensive ''Preview'' chapter where the more complicated moves are broken down in a one-on-one instructional format. Blast more fat away with the short and sweaty ''Power Up'' chapter: a drill-style plyometric push of the body. Time will fly by as you groove to the music provided by DJ Rick. Before you know it, you will have conquered another ''Challenge'' workout! The DVD contains premixes to customize your own workout.