I go to the gym regularly, I've lost 30 in weight since February, I can do a brisk-ish (4.5 km/hr) walk on the treadmill for 20 mins, do work on the rowing machine, do core exercises .... BUT if I even do 60 seconds running on the teadmill I find it so hard and my whole mind says NO WAY! My body says NO WAY! as well! .... Am I just being a wimp?