Resistance level 1 Adidas Power Tubes have a fabric outer sleeve for added safety when working out. Power Tube with resistances of levels 2 and 3 (sold separately) are also available, making this a versatile training product as you can choose the appropriate resistance to suit the muscles being targeted. The outer sleeve means resistance remains constant even when the band makes contact with you. For many years, resistance (strength) training was considered to be all about weights, but the advent of core and functional training led to a requirement for new ways of targeting specific muscles.
