I am trying to work out who to use the bikes in the gym to best advantage whilst training for the Manchester Blackpool ride. I am not going to be able to get out on more than maybe one long ride a week for the foreseeable future so need to get as much out of my gym sessions as possible. (Basically I can sneak Gym trips in whilst at work but getting out for a ride is limited to the weekend due to work and family commitments). If I set the bike to Rolling Hills setting with a difficultly of 10 (out of 20) I seem to be able to do between 130 and 170 watts on this setting. I did 45 minutes at that yesterday and it didn't push my heart rate up much past 130, (it was as low as 110 for some periods). Am I better pushing up the intensity and length of the Rolling Hills setting until I am getting nearer to MHR (160bpm) or doing shorter sessions at a higher fixed setting with some interval training worked into it? My reasoning behind "Rolling Hills" is that it feels more like a real bike ride so will presumably help my stamina but isn't giving me much practice for the longer hill climbs. I read on here about somebodies training routine involving holding at 240 watts for a significant period of time which worried me somewhat as I find 170 watts pretty hard work to maintain for very long at all. Oh - I'm 33, male, over 14 stone and fairly new to this whole fitness thing after losing loads of weight last year.