Does swimming help your running fitness improve after injury?

I was on a call with an active athlete who is recovering from a couple of different injuries and her main goal is to get back to running at high intensity. But while she has been injured and she cannot really run, what she has been doing is cycling, swimming, and doing a number of different strength training workouts to supplement her running fitness. She asked me an interesting question and she wanted to know whether or not swimming was really helpful in terms of her cardiovascular fitness more than just her specific running related strength. Does swimming really help your running fitness improve after an injury?  Well, that is a great question and that is what we're talking about today on the Doc On The Run Podcast.