When I started training longer than 10K, I was seeing signs of shin splints- tender shin bones and tight calves. I started running with calf sleeves and it made a lot of difference both in reducing the pain and helping me recover faster. I also started doing calf and ankle stretches (downward dog is the best for this!) and just in general I’ve adapted better to running over the last few years, so now I don’t use the calf sleeves even though I’m running marathon distances.