Spinning

My husband and I run spin classes and have about 12 clients per class, most of us are around 45 to 50 years old. Those that wear a Polar FT1 heart monitor burn typically 600/750 calories per 45 min session. We have computers on all the bikes and the ones that don't wear monitors read at about 450 but that is just an average, they are really burning the same as the others. The only real way to see how your heart is performing is to wear a monitor.