Shin splints are one of the most common issues guys run into when they first start running and training for selection. Most of the time, the problem is simple: trying to do too much, too soon. There are other factors like running technique, lower body instability, footwear and terrain, but in a lot of cases things improve when you follow a gradual progression instead of ramping everything up overnight. Even if you feel fine cardio-wise, your bones, tendons and connective tissue need time to adap