Subject: RE: Two beginner questions yes, domlazz is right. adjusting your bike to be more "tri" means getting into a more "aero" position.
aero bars on a tri bike definately give you "free" time but just as fraggle mentions, be careful about a "forward" seatpost as it can cause your weight to shift too far forward and make the bike unstable in the aero position which, in itself, is inherently less controllable than a standard road bike position on the handle bars.
finally, a tri bike has a steeper seat angle than a traditional road bike and when you ride a tri bike you use less hamstring muscles with the steep seat angle and in the aero position than you would in a shallower seat angle in a traditional road bike position.
In addition to this steeper seat angle allowing you to have a faster run split due to the hamstrings being used less, it also allows your weight to be correctly/safely centered on the bike.
If you happened to watch the triathlon races at the Olympics, you'd have noticed that all the athletes road traditional road bike geometry and this was due to the fact that it was a quite hilly course and the traditional road bike geometry allows more use of your hamstrings (as I mentioned above ) as well as more use of your lower back muscles. Climbing hills on a bike w/o the use of your lower back muscles makes it much more difficult.
Oh, I forgot to mention that the tri bike geometry doesn't use your lower back muscles as much and therefore allows you to recruit them during the run leg. . . again for faster run splits.
Probably more information than you wanted to know, but hope it helps answer your question.
Runnings shorts are a very personal preference. My favorite ones are made of very nice, light 100% nylon with a coolmax liner brief.
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