j/fit 2-in-1 Low-Impact Exercise Core Rider & Stationary Bike 2-in-1 machine for a simple-to-use complete body workout The only portable machine that works both cardio, core and upper body muscles Dynamic crunch-motion exercises your entire body--arms, chest, shoulders back, abs, legs and butt Complete your training with Core Rider's fully-adjustable stationary cardio bike Lose weight and tone muscle as your increase cardio endurance Large contoured seat design Large LCD display tells time, distance, speed and calories burned Tension control system