Afternoon,
I've done a few ultra trail races (ranging from 30 2 100 milers) the best option I've found is too run the flats & down hills and WALK the hills (while walking the hills eat and drink!)

Re hydration systems - i've got a belt that has 2 hip mounted bottle holders and a bun bag in between - this works for me - remember what works for 1 person doesn't work for another - go with what you feel is best for you!

enjoy.

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 > Date: Mon, 2 Jun 2008 04:31:29 -0700> Subject: key to successful trail running & hydration system> From: vincebee...@twofour.co.uk> To: endurancelife@googlegroups.com> > > I was told that the key to trail running is: keeping about the same> amount of exertion/effort throughout (whether uphill, downhill or> flat). Is this true and is the best way to judge this the breath/> breathing rate?> > Also, what do people think of a rucsac type hydration system (eg.> Camelbak) versus a hip mounted bottle holder (eg. Lafuma). In other> words, weight ditributed across shoulders, back and hips (but sweaty)> versus a lot of jangely weight on the hips? What's best? Opinions,> please?> > Cheers. Vince> > >