Five weeks of 10-20-30 training

I finished my 10th 10-20-30 interval session today. I ran every step of this week's training on my toes. That includes warm-up, cool-down and easy running. I am very surprised I could do that and realize 10-20-30 training was the reason. I have soreness in my Achilles that only appeared this week. That is to be expected due to the new running technique. I am looking forward to running my last two interval sessions next week.