You were correct. My first two workouts were run/walk 3min/2min for 35 minutes. The first day I did it on the levee path I was doing the C25k on and everything went fine. The next day was crosstraining on my bike, and the third day was a repeat of day one. So far so good. Day 4 was a rest day and Day 5 was suppose to be another bike day but didn't get it worked in so had two rest days. Day 6 was another 3min run/2 minute walk but instead of 35 minutes it was until I had covered 5 miles. I had done the third day on a new route, the Tupelo Trail along the Natchez Trace in Tupelo MS. This is a 6 mile trail with some small ups and downs but nothing major. I figured I could do the 5 miles on this also and use the 6th mile for a cool down. Was really having a good run, though after the third mile I could tell I was really slowing down. Then at mile 4 I started having some discomfort in my left Achilles Tendon. It wasn't anything major, not really much at all, so I kept running and finished the 5 miles. But by the time I got to the finish, I could tell I had done some damage. I was wearing a brand new pair of trail shoes, but I think it was just doing too much too soon. I have not done any running since then, but will go back to riding my bike today. I have an appointment with a Sports Medicine Specialist next Wednesday to get evaluated. Hopefully it will just be a matter of a little rest. It doesn't hurt much, just can feel it a little when I walk, so hoping for the best.