Men hitting the big 4-0 often find themselves at a crossroads. The energy of youth gives way to the responsibilities of middle age, and the body starts to hint that it won't tolerate the same old habits. But here's the deal: getting fit after 40 isn't just about vanity. It's about longevity, vitality, and becoming the silver fox who's not just alive but living. Embrace the Journey, Not the Destination First things first, gents. Drop the 20-year-old mindset of beach bodies and six-packs. We’re not teenagers prepping for spring break. Think long-term investment. Fitness after 40 is about being able to play with your kids (or grandkids), keeping up with your partner, and making sure your body doesn't betray you when you decide to climb that mountain or dive into…