Damn, attendance is spotty at the HIIT running class on Fridays and there is talk of changing it to an Ultimate Challenge class. Ultimate Challenge classes are a combo of HIIT and circuit training, sort of a Crossfit Lite thing, and they are good. Someone of average fitness could take them three times a week and add in a couple of steady cardio sessions and improve their fitness a lot. However, not me. Full sessions devoted to lifting and full separate sessions for cardio work better. Barbell full-body training and recovering from it is enough strength training and that interval class is a perfect added exercise for variety and cardio. So I voiced my opinion to the instructor and her boss and one rather loud-mouthed other instructor and going to hope for the best. In the short-term it isn't a big deal, the weather should be nice until June for steady-state cardio outside and I can take Spinning for variety too but those interval classes are kick-ass.