Active exercise, Aerobic exercise,endurance exercise, isokinetic exercise, isometric exercise, kegal exercise, passive exercise, resistance exercise..

No, pigs do not have to exercise. Obviously, exercise is better for everyone, but no pig has to exercise.

__________ is a principle of exercise stating to improve at an exercise or skill, a person should perform that exercise or skill.

Free exercise is exercise that you can do without paying a fee. You can find free exercise videos on the Internet.

Aerobic exercise is cardio exercise (where you get your heart rate up).

Resistance exercise is weight training using resistance.