Now let's use the weight machines .   How about the rowing machine   Great . They've all got built-in TVs .   Cool ! We can watch Ally Mcneal !   But we could just stay there for 20 minutes .   What exercises can I do to firm up my backside   I would recommend doing some squats . Spread your feet about shoulder-length apart , toes facing forward , and slowly bend at your knees .   Like this ? 