Another reason for doing resistance exercises other than isometric type of movements is because you also want to build up the muscles and connective tissues through their normal ranges of motion.
The only way that muscles, tendons, and ligaments get stronger is to push them beyond their normal limits and also through their normal ranges of motion.
It may not always be necessary to actually use external weight, however. There are hundreds of bodyweight exercises that will help you get drastically stronger as well as maintaining strong and true ranges of motion at the same time.
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