If you're not doing any weight training, start now. "It retards the aging process on a cellular level." A recent Spanish study found moderate exercise boosts the functioning of the cellular engines called mitochondria, which helps counter the signs of growing older.
"You simply need to adjust what you're doing to get more out of every workout. It's a matter of working smarter, not necessarily harder," Start with easy tweaks to your routine. You'll soon become stronger, slimmer, and healthier, for your 40s and beyond.
Beginners need to start with light weights. But if you're still using the same weight you've been lifting for years, now's the time to increase it. Don't worry about bulking up. "In fact, the more you lift, the leaner and smaller you will be, because muscle is more compact than fat.
