Unfortunately, the vast majority of Americans over the age of 45 (75 percent) do not engage in any strength-training exercises at all, which puts you at an increased risk of weakened bones (osteoporosis), age-related muscle loss (sarcopenia), limited range of motion, loss of functional movement, aches, and pains. If you're like most people, you want to stay strong and agile… and you certainly want to continue to live independently, doing things you might now take for granted (like shopping for groceries and climbing the stairs) even when you're in your 80s and beyond.