lets assume you have a gamrin. so buy a GSC10 as well. you then get all the heart rate speed cadence stats on your watch. if you use sporttracks and the trainerpower plugin (both either free or very cheap) then you can convert speed to watts as well.
you should do a like for like test every 4-6 weeks. everything must be the same ie same tyre pressure, same recovery etc etc
Do a CP6 followed by at least a 6 minute rest and then do a CP20 (see Friel)
this is a critical power test for 6 and 20 minutes. you basically want to go as far as you can in each ie to exhaustion. The measure is av speed or av watts you will also record avHR
if you are better next time around then your training is working (or you were not trying hard enough first time)
look into these CP figures more and you will be able to determine what levels you train at over other distances/times. eg you use CP20 to work out your FTP or CP60 and then from that you can determin optimal trianing sessions eg 85% of FTP for 2x20 minutes with rest is one of the better sessions.
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Running 5k Better More: http://the5krunner.com
Goals: 82% Age Graded 5k and an open water Triathlon Hyde Park would be nice
Edited: 20/12/2012 at 16:17