It’s also simply nice to feel strong. I like picking up heavy stuff now (like my kids!), and I no longer get sore from dragging luggage around at the airport. Still, there are some possible drawbacks with weight training for those trying to maximize their running potential. For example, you might gain weight which could lead to reducing your running economy. There is a tradeoff, however. Running is a mix of weight and power, and of course, you want to have power—so the key is balance. Making yourself as strong as possible (even in your upper body) while staying as small as possible should be the goal for those looking to run at their peak.