Interesting thread...

I can feel the benefits of swimming on biking and running, mostly in the way I breathe and pace my breathing, and that it's an all-body workout. Also great for recovery, mentally and physically.

I think running benefits my cycling by extending my aerobic fitness, but there's still a lot of muscle-specific stuff that requires cycling-specific training (hills, riding aero). Running is harder on my body, but it's the thing I have the hardest time with, so I have trouble shorting myself miles.

Cycling benefits running definitely as a recovery exercise, and it's sometimes easier to control my heart rate cycling than running so I can get specific zones of activity (especially lower zones - the gap between a light jog and walk you can hit easily on a bike, good for recovery; or high intensity but not maximum intensity zones).

Makes me tired just thinking about it.