Consider the stereoisomers (A-E) drawn below: 
Structures C and D are ________.
Definitions:
Isotonic Exercise
Physical exercise involving movement against a constant load, where the muscle length changes to move a weight.
Isokinetic Exercise
Physical exercise involving machines that allow for movement at a constant speed regardless of the force exerted, used especially for physical therapy and athletic training.
Muscular Endurance
The ability of a muscle or group of muscles to perform repeated contractions over a period of time without becoming exhausted.
Exercise Myth
Misconceptions or false beliefs surrounding physical exercise and its effects on health.
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