todays 20 minute run didn't start well, felt like i was struggling in the first few minutes and i should truy again in a few days, but kept going anyay.
After getting halfway i felt it was not going to carry on much longer, then i had 2 minutes left, then it was done.
My calves were pumped, lactic acid and swollen with blood, but other than that i was fine.
so glad i trusted the program and kept going.