21813 ProForm 230 U Exercise Bike Get Started on Your Way to Fit Built with both comfort and performance in mind, the ProForm 230 U exercise bike has all your favorite features and delivers a premium workout at home. The ergonomically designed cushion seat adjusts both vertically and horizontally for a customized fit, while the convenient Step Thru design makes getting on and off the bike simple. Smooth digital resistance offers 16 intensity levels that pair beautifully with 14 built-in workout programs designed by a certified personal trainer. Need inspiration? Plug your MP3 player into the port on the console and rock your workout to your favorite music.