The method that is not used to increase muscle strength is C. Isopronetic
Isotonic refers to the contraction of the muscle. Also, isometric exercises are vital for muscle strength. Isometric exercises are vital for the maintenance of strength.
Isokinetic refers to the strength training for the muscle. In this case, one uses exercise machines. It should be noted that isopronetic is not used for the development of the muscle.
In conclusion, the correct option is Isopronetic.
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