The two methods that I use a lot to recover from long runs and from increased amount of running include high speed spinning on a stationary bike and walking. I definitely notice a difference when I utilize either after running a lot. I feel like it clears my muscles of toxins, loosens me up, and just makes me feel fresh again.
Today, I walked quickly for about 1/2 an hour. I would estimate I was somewhere around 2 miles, but it doesn't matter. After running twice yesterday, both being strong 4 milers, I feel great today post walk.
Tonight, I play old man softball and will get some fast running in and unintentional speed work. It's nothing huge, but I get a good sweat in running for balls, on the bases, etc. Cross training at its weakest!