I see some trainers believe that anything under 10minutes is not worthwhile, not sure I agree with that, so I added to my time to 11minutes on my 3rd round this morning. Each time I go down to get a cup of coffee I due a circuit of bike(trainer)/stair(stepper machine)/skiing(Nordic Trac). Was hoping to not perspire at all, however going from 8 to 11 minutes did it, just a little. It will be down to 11F outside shortly here, a little to cool.