elliptical trainer

noun
  1. an exercise machine like a stationary bike without a seat, so that exercising is done in an upright position, and having pedals that the user moves in an elliptical pattern, believed to minimize strain on the knee joints.
Also called elliptical, elliptical machine.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018