5 min read AS YOU GET older, the way you approach life changes. You have more wisdom than you did when you were a young man from all your years of experience—but in some settings, like the gym, you'll need to adjust your behavior to keep up with the changes that happen to your body when you age. That's why men over 40 should take a slightly different approach to fitness than their younger peers, with an emphasis on careful, calculated programming. The Men's Health Muscle After 40 book gives you that smart, measured plan you need for your workout as an older man. The 12-week fitness guide doesn't give you handicapped workouts with instructions to play it safe—the plan is designed to bring out the best in you while allowing you to rest and recover within your body's capacity. Muscle After 40 is split into 3 distinct phases, each of which consist of 3 weeks where you'll train 3 times. This is Phase 1, Week 1. Warm Ups IF YOU KNOW what works best for you, keep doing it.…