If you’ve picked up the handle of an ergometer, the indoor rowing machine that represents so many things for rowers, you know what it feels like. Think about the grip, the handle that connects you to the machine. Feel how the weight of the handle rests in your hands, the chain slack as you sit on the sliding seat. The machine invites you to slide your feet onto the footboards and cinch the strap around your shoes. The monitor lights up, almost begging you to bring it to life, to take the first few strokes and let the numbers start calculating.