The Concept II Type 'B' Rower is elegantly simple. You pull on a chain that rotaes a cast-aluminium flywheel. Fan blades built into the flywheel create wind resistance to slow the flywheel down. The faster you make the flywheel go, the greater the wind resistance and the more work you expend. The momentum of the spinning flywheel caries you from stroke to stroke, leading you on through your workout. The Concept II Type 'B' is rugged and is designed to be a lifetime investment.