the treadmill is my favourite thing at the gym.i can get a bit addicted to it and tend to not want to do anything else.i walk at 4.5mph and run at 6.5.the walking drops bgs down to under 70mgs usually but the running can raise bgs for me.i like to do about 1 hr,20mins walking, then run and finish off with 10 minutes walk.
have to have the walkman on all the time-bon jovi works well,keeps me going.
And yes,ive used the treadmill to flatten out bgs after a "splurge"works like a charm!