In Reply To:
Skiing is also seriously quad-dominant. Running - especially something "longer" like the 400m - is going to be predominately hamstring dominant. I would think that Vonn would do best where "out of the blocks" type motion - even something like 60m, which is run indoors - is way more her style.
Agreed, but from what I can tell (you know, from watching TV and stuff), top level ski racers do a ridiculous amount of cross training including plenty of aerobic work, and strength work on all the muscle chains...running, cycling, stairs, box jumps, deadlifts, lunges etc...up the wazoo. Bike racers can get away with relatively overdeveloped quads and constrained range of motion (and then cripple themselves en masse running through an airport to catch a plane - per Davis Phinney if I recall the anecdote correctly), presumably because the bike supports their weight so much of the time.
I'm not saying she could actually run :52 or even close to it - but based on what they supposedly do in and out of season, I think skiers _at her level_ are pretty well rounded and do not necessarily have weak hamstrings or underdeveloped aerobic capacity relative to their genetic potential. Same with speed skaters though maybe to a somewhat lesser extent. Yes, a 90 second downhill run uses a lot of quad, but that's a tiny percentage of the training she does.