There are two types of muscle fibers in your body. One is fast acting and for short duration and strength. These are the ones that you build up for bulk. The other are slower twitch and long acting. These are your endurance fibers. If you work them both properly you can increase both but if you do a lot of running you will probably develop more of the long acting fibers and not get too much bulk out of it all. Look at Armstrong. He has very little muscle mass in the upper trunk because of all of his type II muscle fibers. He does have some bulk in the legs though, because he uses them when he rides.
endurance is an opinion.cross country or running can be very hard on your joints which can make it very hard (on top of the obvious strains like running)cycling can be gruling but is mostly legs.in my opinion swimming wins. imagine running 12 miles and taking a breath every 5 steps... well that's my swim practice.by the way i do all 3 sports and they are all difficult just in their own ways
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