I notice more and more downhill marathons, primarily geared toward people trying to make their BQ or PR. I was first aware of St. George and Steamtown, but now they've been topped by many marathons with 4000+ feet of elevation loss. REVEL has 4 now (Big Cottonwood, 3 others). There's also the Freaky Fast. I saw Jack and Jill's Downhill Marathon. I think Light at the end of the Tunnel is another (they run it twice). I'm now mid 40's and a few years past my PR 2:49. I've taken to more ultras and trail races, resigned to the fact that my PR isn't likely to improve much. But maybe with the help of a downhill I could.
How much of an advantage is a huge downhill course? Has anyone tried one of these types of marathons and found success? Or had an awful experience?
How can you get your legs ready for that kind of downhill pounding? I can see doing downhill repeats maybe, but I've got to get back up the hill. I can't think of a way around where I live to get a long sustained fast downhill run. My treadmill will go to -2%, but 4000-5000 feet loss is like -5% grade (usually the downhill isn't even, usually first 15-20 miles of the courses). And I'd be afraid to burn out my treadmill with a long run at that kind of speed/decline.