Final answer:
Selectorized machines offer targeted muscle isolation, ease of use for beginners, and a controlled range of motion, but do not increase joint mobility, which comes from other forms of exercise.
Step-by-step explanation:
The benefits of selectorized machines include targeted muscle isolation, ease of use for beginners, and a controlled range of motion. However, these machines do not inherently increase joint mobility. Increased joint mobility is often the result of activities like stretching, mobility exercises, or functional training, rather than using fixed-path resistance machines.
Having most skeletal muscles attached close to joints provides benefits such as increased speed of limb movement, and enhanced flexibility and agility, due to the large number of joints and the extent of their range of motion. Selectorized machines utilize this biological principle to create effective workouts, but the actual increase in joint mobility must come from other forms of exercise that are designed specifically to enhance the functional movement of joints.