Just started Couch to 5K this week. I've never run before - unless it was an emergency! Enjoyed runs 1 & 2 but 3rd run today was very difficult - worse than the very first one. Legs seemed heavy straight away and cramp towards the end. Only managed about 3 complete sets of 60 second running! Disappointed in myself and disheartened. Don't want to give up at this early stage. Any ideas or suggestions welcome?