I recently stumbled across C25k and decided to give it a go. I'm 42 years old, very unfit and have asthma. I really wanted to get fit, lost some weight, and generally feel better about myself. I was nervous about starting week 1 but I bit the bullet and got out there. The first run was AMAZING! I loved it. I couldn't believe how good I felt afterwards. The second run was the same. I was worried that my asthma would let me down but it was fine. Yesterday I completed run 3 and felt OK apart from a slight ache in my calf muscle - until I finished the final run and started the 5 minute walk to cool down and I suddenly felt extreme pain in my calf and ended up limping home totally deflated. I had it checked out by my GP this morning and she has advised not to run again for several weeks. I am gutted.