Week 5 run 3 completed successfully tonight. It was tough but I managed to keep going. Another runner went past me at the pace that I had imagined I was was doing but obviously wasn't - I went super slow so that I could last the 20 minutes but I still can't believe how far I have come in 5 weeks! The downside was that after the final brisk 5 minute walk I felt nauseous for about 2 hours. I read that it might have been dehydration. How much water should I be drinking? I drank 1/2 litre immediately before and around another 1 & 1/2 litres throughout the day. I hadn't eaten for 2 hours before I ran.