What does it mean?

I did what I consider a fairly vigorous workout on my stationary bike twice today so far (thanks to the rain).  According to my bike, I burned 71.7 fat calories.  Is that good?  I KNOW one of ya'll will know the answer. 

how does it figure the burned calories?  Does it depend on entering your height and weight or something like that.  I hope that's good!  It's great that you got in TWO workouts on the bike today!  BRAVO!

I have a really nice recumbent computerized bike that tells me all kinds of stuff.  Oh, for the record, that 71.7 was in just ONE ride.  I think it bases the burned cals on time, speed, & resistance which is automatically programmed in.  I have to just keep an eye on the recomended RPMs & make sure I keep up.  I did much easier rider in the AM, but wow...that 2nd ride...it challenged me for sure...LOL.  I'm hoping somebody will be able to tell me if burning that many fat cals is good.  As for regular cals, it said I burned 229 on that ride.  I have no concept.  I intend to do one more ride before bed...an easy one. Thanks for the bravo! lol

http://exercise.about.com/cs/cardioworkouts/l/aa022601a.htm Check this link out sweety. See if that helps . You did a good thing . Calories burned -are calories gone .  Way to ride !  Tink