Cadence is the number of rotations you make with your pedals per minute. A lot of people ride their bikes with a cadence over 90 for as much of the ride as possible. When I first started riding and got the cyclometer, I thought 100 was terrible and I was jumping out of the seat. Now I can hit 120 and still be pretty even, but anything higher and I feel like I am just bouncing everywhere.
If I am on the road with my Ventura Sport, I am usually pushing myself and watching my heart rate. If I am on trails with my wife on the other bike, I go much slower with everything.
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2007 Jamis Ventura Comp
2006 Jamis Explorer 2.0
2000 Specialized Hardrock (bought used)
Swim, Bike, Run and sounds like fun