In Bicycle terms:
The rate (RPM or revolutions per minute) at which your legs turn the pedals on your crankarms
. The rate at which your turn is merely determined by your cycling style (or vice versa) as well as your physical conditioning.
10 to 40 RPM - You are too slow. Either speed up or shift down. (How can you move?)
40 to 70 RPM - You're either climbing a large mountain or you love big gears on flats.
70 to 90 RPM - This is the ideal (everyday cyclist) cadence to ride by whether on flats or up hills.
90 to 120 RPM - Either you don't know how to ride a bike or you're in great shape when you're pushing this cadence on a 53T x 11T.
120 RPM + - You are probably riding a fixed-gear bicycle and a Curt Harnett wannabe.