Fortunately I was in the early weeks of discovery that I had a heart condition where I was having palpitations. Not because of the running but the running helped me to confirm that I had a long term problem. I really tried to complete the 1st week of C25k program and noticed I was too out of breath. I am a gentle cyclist so I really noticed that the exertion of the first week was too much. Following a check up and an ECG my doctor /now hospital has confirmed the problem and lined me up for an ablation procedure. A flexible wand will be inserted in a vein and a nerve attached /alongside my natural 'pacemaker' on my heart will be frozen dead to stop the erratic heart beating that has caused me to be out of breath. It is a common procedure. Apparently it is the same procedure that Tony Blair had done recently. So this C25k program is a bit of a life saver. I will be given appropriate medication when I get back from holiday to start the procedure. 90% cure guaranteed. I will repost in Feb /Mar to let you know how I get on. If no posting in April /May.... well, it didn't work! LOL.