while staying in one place. The step platform itself is much less expensive and more portable than a StairMaster, and needs no electricity to operate. Music for step aerobics should be medium tempo, typically 118 to 122 beats per minute (bpm). A rhythm of 126–128 bpm is sometimes used for advanced classes; Reebok defined 128 bpm as the "fastest permissible speed." The style of music should emphasize the beat, for instance a steady four on the floor rather than offbeat syncopation. Choreography requires that the music present a predictable 32-beat, eight-measure sequence. Playlists for aerobic dance may include such songs as "Strut" by the Cheetah Girls, "Carry Out" by Timbaland featuring Justin Timberlake, and "Every Teardrop Is a Waterfall" by Coldplay. Step and bench devices are usually molded polyethylene plastic, covered in rubber or other non-slip surface, with the lowest height starting at . This height can be increased in increments to . Studies have been made of 10- and 12-inch benches, but these are not recommended for popular step aerobics classes. The height of the step should be tailored to the individual; lower levels for beginners. Typical steps have a length and width of . A smaller product called Super Step was . The step is never approached with the participant's back toward it. While women were already doing aerobic dance in the 1970s and 1980s, outnumbering men 9 to 1, men were attracted to step aerobics in the 1990s because the style was simpler, not based on dance choreography with unfamiliar dance lingo. Mixed-gender step classes were common from the start. On the other hand, dance routines can be brought into step aerobics, for instance Phillip Weeden's "X-treme" hip-hop dance program with music by Beyoncé, Silentó and old school rappers. Elements of step aerobics can be blended into other exercise styles such as kickboxing or Zumba to create hybrid or combo styles. References External links 1992 Step Reebok video featuring Gin Miller, 58 minutes Aerobic exercise