Luckily I'm in a position where the muscles were never really a problem, I've been a regular on the free weights at the gym for the last 7 years. My C25K trip has been mostly about aerobic fitness and learning some psychological lessons.
Looking at my Strava splits from the Garmin today my pace for KM's 2-5 were all pretty constant (within 15-20 seconds of each other), and there was enough left for a burst at the finish line. I was actually really surprised because in my head I "felt" I was slowing down significantly as the race progressed.
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