training effect crossover.
does the bike help the run? does the run help the bike?
which helps which more.
been thinking about this, as i have a marathon coming up b4 my i.m. this year.
Seem to remember reading somewhere that your bike fitness will complement your running fitness but not the other way round. Though don't take my word for it, because I may be wrong. Obviously there will be some aerobic crossover from general fitness
In my experience biking does help your running a great deal even if you don't do much running. LAst time i did 1500m was summer of last year and got 5 mins flat for it. Since then i have not done much running apart from an odd crosscountry race. Apart from that it's all been cycling (and alot of it). Then last week i did the 1500m again and ran a 4 44, so there's been a major improvement thanks to cycling although it's still better to run in training if you want to maximise the benefits.