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I can start off ok, then in the middle 3rd of a race (e.g. after 2k of a 5k race), my pace will drop off a bit, then I'm able to pick it up towards the end. Oddly enough, there were a few races last year when my last kilometre was my fastest. Is it that I need to toughen up mentally when I feel my pace dropping and just dig in a bit more? Would some sort of training geared towards negative splits help?