>Cross Training>Is swimming good for running?
I relied on pool running when I had a stress fracture. I was amazed how much running fitness I kept from it. It doesn't really engage the calf muscles, but you can really get the quads working hard in a certain way. If you are injured or want some additional low impact run-specific exercise I would definitely pool run instead of swim. It can definitely get boring though.
It's really not any more boring than looking at that blue stripe at the bottom of the pool. I've done enough of both to rank them roughly the same in terms of boredom. However, from a fitness stand point deep water running benefits running more, while swimming builds a different kind of fitness. If you're just looking for a low impact exercise for fitness, seems like any movement is good.