I know there have been many threads so far about running, running times and where/places to run however, my question is slightly different (I hope).
Is there anything (gym wise) I can do to increase stamina/cardio?
My reason for this is, once I'm on the treadmill I'm fine up to the 2km mark and anything after that... I feel quite faint and somewhat nauseous, I'm guessing due to lack of oxygen pumping around (is that correct?)
They have all kinds of fancy machines at the gym but tend to do approx. 45 minutes cardio (15 minutes on the bike / 15 minutes on the skiing machine thing & 15 minutes on the rowing machine) about 4 times a week, along with swimming and some other strange looking machines.
Any tips? They'd be appreciated, greatly!
PS - I recently quit smoking, so hopefully over the coming weeks, my lungs should expel the ‘crap’ the cigarettes left behind (fingers crossed!)

