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I don't know if anyone else has experienced this, but I find during some quicker races (5ks etc) that I get really bad tummy troubles towards the end.
In the past I've learned to not over do the number of gels I take on a Half Marathon or something, as I've experienced problems late in a race; but in a 5k when I'm naturally not using gels or anything it can feel quite simliar if I'm racing for a PB.
I'll tend to get up early, eat a small breakfast (small bowl of poridge or something) about 3hrs before the race and have a tea or coffee, but that's my normal routine before a long run on a Sunday - it's just the quicker runs (pardon the pun) when I'm trying hard that get me.
Any advice is much appreciated, as I'm convinced I could shave off 10-15 seconds without this discomfort and worry of something embarrassing happening!!