J.Rapp Slowtwitch Indoors: Slowman Returns - 8x4min/2min SST High Because of the relatively short rest in between intervals this is a challenging workout to do on the road because you need either a fairly long hill or an extremely steep one because it is nearly impossible to get back to the start otherwise. As a result a workout like this is ideally suited to indoor training because the challenge of finding suitable topography is reduced. bike