Exercise increases muscular strength and endurance. Exercise prevents muscle tearing or injury. The body must warm up first by stretching, or (if using weights) starting light.
Too much too soon, and muscles tear, bones can break or fracture, sprains can occur, etc Some older adults can have a stroke or heart attack when exercise is excessive Everyone (no matter what age) should warm up before starting an exercise routine. If you do not this can cause injuries like pulled muscles, twist ankles, wrists etc. Or you could even sprain a part of your body For information about all the benefits of exercise see the page link, further down this page, listed under Related Questions.
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