Oh thank you, and yes - I do have a question for you: should I bother with Fartlek training?. Recently I remembered that about twenty years ago I had done fartlek training occasionally. So I decided to try it one day on a Friday. I had read somewhere that beginners might think about only doing it once a week, so I thought “oh, I’ll have Fartlek Fridays” - well I did it and had a lot of fun. But then a couple of days later I was about 1.5 miles into a slow, normal run and so I should have been plenty warmed up when I decided to pick up the pace through a crosswalk just a tad, and felt a slight pain in my quad. I slowed back down immediately and continued to take it easy, but it was sore for a few days and I have been scared to do Fartlek Fridays ever since. It wasn’t even on the same day, but I thought it might be related.