On days when I am not slogging through C25k, I go to the gym and do a one hour cardio circuit: 20 mins elliptical machine and 20 mins bicycle, both on hill programmes at level 16/12 respectively, then 20 mins on the rowing machine, with no more than 30 secs between each machine. I also do a spin class once a week. It's tough work and I am sweating buckets and breathing hard by the end, but I can do it. Whereas my stamina while out running is far far lower. I'm getting through the runs and progressing, and I realise the running is higher impact than the gym work, but there seems a big discrepancy to me between being able to do 45 or 60 minutes of hard cardio in the gym and gasping for breath at the end of 8 minute slow runs.
Can anyone shed any light on this?