Leg soreness from balance training for runners

I was just on a call with a guy who signed up for the Runner’s Aid Station and one of the things we were talking about is he had noticed that while he was doing some specific exercise I gave him to restore some of the balance to actually make him a little more stable and more efficient. He noticed he was getting a lot of soreness in his leg. He was actually explaining what he was getting in terms of muscle soreness and we discussed whether or not it was really a problem and something you really need to pay attention to. Today on the Doc On The Run Podcast, we're talking about soreness in your leg when you're working on your balance and you're trying to get back to running after an injury.