Final answer:
Isokinetic exercise is the type of isotonic workout that maintains a constant velocity throughout the range of motion, facilitated by specialized equipment.
Step-by-step explanation:
The type of isotonic exercise that keeps the velocity of movement consistent throughout the range of motion is the isokinetic exercise. Unlike concentric and eccentric exercises where the speed can vary, isokinetic exercises are performed using specialized equipment that maintains a constant speed regardless of the force applied. This allows the muscle to contract at a consistent velocity throughout the entire movement, which can be beneficial for rehabilitation and muscle strengthening.