Fattest Thin Man
Join Date: Sep 2005
Location: Directly above the center of the earth
Bikes: Miyata 610, Vinco V, Rocky Mountain Element
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The information you need is best determined by what it is you're trying to do. Weight loss, racing, endurance, etc.
Generally speaking, the more info the better. If your goals or ideals change down the line you're more likely to have the info you thought you'd never need if you track everything.
But the big items to track are distance, avg. speed. HR, time, weight, type of course, And I like to make a lot of notes about weather and how I'm feeling etc.