The length of an eccentric motion that a muscle can perform is
a. Aerobic
b. Flexibility

The length of an eccentric motion that a muscle can perform is  b. Flexibility

Explanation:

Eccentric contraction means almost the same as muscle strengthening. This type of exercises are used in sports recovery or different types of rehabilitation. These kind of flexibilty (or stretching) exercises enhance the extensibility of the muscle. Eccentric contractions use less metabolic energy and the idea is to challenge the muscles.

coal is not sustainable because it will one day run out.

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