So I've been doing the 5k plus stamina podcasts for the last month it so and I've just setup a loose program to reach 10k by increasing my distance by 3min each time I run beyond 30 min . I've only just begun and feel like I'm hitting a wall already. I was up to 36min and though my pace feels decent (usually somewhere between 5:53 and 5:55), i tried to get to 39 min today and could barely get through 32 min! I think its mostly in my head. Could have been a tough day to try it as we just got back from a short holiday. I'm not sure. Any advice on slipping by these mental walls as you move up in distance? I will keep at it though.