I can bike for hundreds of miles but I can't even hit a half marathon. Hell I can't even run more than 10mph for extended periods of time. Plus my knees and ankles hurt when I'm on flat ground so I end up running at like 10-12 degrees and end up doing 1000ft of climb for a few measely miles when technically, at my aerobic level, I should be hitting 10mph for like, a 1/4th marathon, or at least 8-9mph for a half marathon.
Any cyclists out there find it much easier running uphill? My gf thinks it's because the motion has more in common with cycling than running on flat ground.