Complete muscle contraction (concentric) to full extension (eccentric). One full movement is known as a repetition.
Rep Speed
An important, yet often ignored variable in exercise, rep speed is how fast you move the resistance during an exercise. In a workout, make sure you always use smooth and controlled movements. Rep speed is also known as cadence.
Rest Intervals
The amount of time spent resting between your sets. Rest 2-3 minutes to improve your strength, between sets. For muscle size, rest about 60-90 seconds. If you are after general health/toning/fat loss, then aim for no longer than 20-45 seconds rest.
Rhomboids
Attached to the vertebrae at the base of the neck and diagonally to the inside edges of the shoulder blades, the rhomboids pull your shoulder blades inward.
Ripped
Extremely low body fat, to the point where you can see "rips" in the muscles through the skin.
