Modern exercise science shows that working with weights - whether that weight is a light dumbbell or your own body - may be the best exercise for lifelong physical function and fitness. Brad Schoenfeld, an assistant professor of exercise science at New York City's Lehman College ... has published more than 30 academic papers on every aspect of resistance training - from the biomechanics of the push-up to the body's nutrient needs following a hard lift. Later in life, bone tissue losses accelerate and outpace the creation of new bone. This loss of bone tissue leads to the weakness and postural problems that plague many older adults. "Resistance training counteracts all those bone losses and postural deficits," he says. For anyone at risk for metabolic conditions - type-2 diabetes, but also high blood pressure, unhealthy cholesterol levels and other symptoms of metabolic syndrome - strength training is among the most-effective remedies. Strength training also seems to be a potent antidote to inflammation, a major risk factor for heart disease and other conditions. More research has linked strength training to improved focus and cognitive function, better balance, less anxiety and greater well-being. If all that isn't convincing enough ... perhaps this is: maintaining strength later in life "seems to be one of the best predictors of survival," says [University of Michigan professor Mark] Peterson. "When we add strength ... almost every health outcome improves."