recumbent bike: A type of stationary bike with a bucket seat that provides back support so that you pedal straight out in front of you.

repetition (rep): One complete motion of an exercise, often used in reference to strength training.

RICE: An acronym that stands for Rest, Ice, Compression, and Elevation — common treatment methods prescribed for runners with training injuries.

road bike: The traditional type of outdoor bicycle with curved handlebars that is built for speed.

rolling stair climber: A cardiovascular machine that resembles a section of a department-store escalator. A set of stairs rotates in a circle so that you climb continuously, but never getting anywhere.

rowing machine: A cardiovascular machine that increases stamina, upper body endurance, strength, and flexibility by mimicking a rowing motion. Also called a rower.