Had a good W4R1 many, many days ago, and then attempted R2 THREE times and had to give up each time because of terrible shin pain while running. I was going slowly and I was stretching, so I couldn't understand it. I stopped running for a bit and did other things instead, and today missed running terribly so tried a fourth attempt at W4R2 and success! I went slower than slow and pushed through the first bout of shin pain (which was nowhere near as bad as earlier) to see if it would go away and it did! Very pleased, I was scared I'd have to abandon running again. Onwards and upwards!