Less than 25 percent of Americans over the age of 45 engage in strength-training exercises, which are actually among the most important exercises to stay fit and healthy. It’s a matter of fact that your muscle strength decreases with age… unless you do something to stop it. That “something” is strength training. Without it, by the time you’re in your 70s, your muscle strength and tone will have declined by roughly 25 percent from what you had in your mid-30s. You’ll lose up to 50 percent once you approach your 90s. Yet, gaining muscle strength is only one benefit of strength training. This form of exercise also helps prevent osteoporosis, improves your range of motion, and ability to perform functional (day-to-day) movements and even, when done properly, can act as a form of aerobic exercise and even help you lose weight. The more muscle mass you have, the higher your resting metabolic rate. Unlike traditional cardio, strength training …