Concept 2 rowers are quite legendary. They are well-built and more than capable of giving you a killer workout. The Concept 2 Rower Smartphone Cradle lets you combine your smartphone with your rower to keep an eye on your data. It works with smartphones between 2.25 to 3.5 inches in width.
The cradle is compatible with PM5, PM4 and PM3 monitors. Doesn’t cost a whole lot either.