Last week I did 25 mins non stop and felt really good. Today I couldn't even manage 17 mins and I feel crap. I'm not fast so looks like a 5k is going to take me about 40 mins. Based on today's performance I'm not even close and I've only got three weeks before the race for life 5k. I'm just not sure I'm going to make it and I really want to run the whole thing as a personal goal. Does anyone have motivation tips for days like this?