What Muscles Are Used When Using a Stationary Bike?. Part of the series: Fitness & Muscle Growth. The stationary bike is mostly a cardio equipment. Find out what muscles are used when using a stationary bike with help from an experienced technology and start-up executive with a passion for health and fitness for people and pets in this free video clip. Read more: www.ehow.com/video_12335800_muscles-used-using-stationary-bike.html