dose the rom four minuet cross trainer work or a load of b.s.? my dad bought the dvd and they say that four minuets on this machine equals too 45minuets of weight lifting ? i don't believe it and i intend on proving him wrong because theres no way four minuets on that is the same as lifting weights for 45 minuets good answers only , easy 10 if you put time into it ;]