Do you have the urge to erg? I did on Saturday… The snow was covering the city (yes in October) and I decide it was best to stay inside. Went down to the gym around noon with my boyfriend and mixed up my workout routine with a little rowing. Used to be on the crew team in high school and college and totally forgot how hard it was. The machine literally works every bone in the body, including stomach, back, arms, legs, butt (like), etc.