A compact stationary bicycle is configured to fit beneath a desk. The compact stationary bicycle has a silent drive assembly, configured to be driven by a user. A casing is mechanically coupled to the silent drive assembly. An attachment assembly is mechanically coupled to the casing and configured to attach the casing to a chair occupied by the user putting the silent drive assembly well forward of knees of the user. The user of any height can drive the silent drive assembly beneath the desk without contacting the knees with the desk.