So how is it that last night I ran 3 x 5.5 mins 1 x 3.5 mins on a treadmill, felt exhausted but really chuffed but if I try and run off a treadmill I feel like crying in about 3 mins?! Leader of the C25K says its because the treadmill is flat - fair enough. She also says its because the treadmill is moving my feet - ok I could understand that argument if I was basing my runs on distance but running for 20 mins is running for 20 mins in my book! Put it this way, 6 weeks ago I could barely have run for 30 secs on a treadmill so I have definitely improved, but worried I will suffer when we do the real life 5k which clearly wont be on a treadmill... any advice?!