KEEP IT AT 75% IMO
ALSO take into account that it takes 5-10 minuted to get in to the heart rate that you want........
so in the am be prepared to warm up for that amount of time....then do an additional 25-30 minutes at that heart rate.
also I suggest you by a polar heart rate monitor.
the ones that you find on cardio equipment..are flawed
I invested in one.....and was suprised by the results.....and how easy it was to loose some fat.
previuosly I hit the cardio..and was doing it a too high of a rate.
my workouts suffered, and I was not loseing the fat I wanted too.
also DO CARDIO...it will help you heal from your workouts.....keep your heart strong.......and increase flexibilty and blood flow
goodluck
OMEGA