Cardio is fine for your heart, but if you want to survive aging, you need muscle. Sarcopenia (muscle loss) is the beginning of the end for most men. Once you lose your strength, you lose your independence. You become frail, you fall, you break a hip, and statistically, you die shortly after.
Strength training is the only fountain of youth we have. It increases bone density, improves insulin sensitivity, and regulates hormones. But more importantly, it teaches you mental fortitude. The iron does not lie. You can either lift it, or you can’t. There is no politics, no luck, and no cheating under a squat bar.
If your exercise routine consists of a light jog and some stretching, you are failing men’s health. You need to lift heavy things. You need to struggle. You need to impose stress on your skeletal structure so that it rebuilds itself harder.
This isn’t about looking good in a t-shirt (though that will happen); it is about building a chassis that can carry you through the next 40 years without breaking down. Stop exercising to “burn calories” and start training to build armor.