The correct answer to the question is option 'C', J. J. Parrine.

J. J. Parrine introduced the is-kinetic method of training for the development of strength.

The is-kinetic method of training is a type of exercise program that focuses on maintaining a constant speed of movement throughout the entire range of motion. This method of training was developed in the 1970s and gained popularity in the field of sports and rehabilitation.

Explanation:

The is-kinetic method of training was developed by J. J. Parrine, an American exercise physiologist. He introduced this method as a way to enhance the development of strength and power in athletes.

This method of training differs from traditional weightlifting exercises, where the resistance is often greatest at the beginning of the movement and decreases as the movement progresses. In is-kinetic training, the resistance is adjusted to match the force exerted by the individual throughout the entire range of motion.

Key Points:
- The is-kinetic method of training was introduced by J. J. Parrine.
- J. J. Parrine is an American exercise physiologist.
- Is-kinetic training focuses on maintaining a constant speed of movement.
- The resistance is adjusted to match the force exerted by the individual throughout the entire range of motion.
- Is-kinetic training is used to develop strength and power in athletes.

This method of training has been widely used in sports training and rehabilitation programs. It allows athletes to train at a specific speed and resistance, which can be adjusted to match their individual needs and abilities. Is-kinetic training is often used to improve strength, power, and muscular endurance.

In conclusion, J. J. Parrine introduced the is-kinetic method of training for the development of strength. This method focuses on maintaining a constant speed of movement throughout the entire range of motion and has been widely used in sports training and rehabilitation programs.