How running injuries compare to savings accounts

I am sure that you have heard your running buddies use an analogy:  "We just banked another long run.”  “We got another hard workout in the bank.”  All these efforts and investments in our training add up. They create this great store of energy for us. The accumulation of fitness is what prepares us for a marathon an Ironman, or an ultramarathon. Today on the Doc On The Run Podcast we're talking about how running injuries are a lot like a savings account.