She gripped the handle of the zip wire, closed her eyes, and flung herself into thin air.

The user grips the handles below shoulder height and pushes and pulls them while shuffling the feet back and forth within elliptically-shaped paths.

A patient sits in the birth chair, gripping the handles and the midwifes assistant stands behind her providing support.

One simply knows to step on the pedal, propel their body up onto the seat, grip the handles, begin to pedal, look ahead, check the gears, balance oneself, etc.