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good luck with the training…not long to go now. You are doing a sprint duathlon not a mammoth distance event. So your carb loading may be an overkill. You just really need to make sure that after your exercise you replenish the carbs and water AND PROTEIN. Just by tapreing and eating normally on race day you WILL have enough carbs in your body for the race, honest, you will not need anything more than a lucozade sport in the race and that will hydrate you as well. When you train do some bricks , NOW, at the end of every session you should be thinking…hmm that was hard (but not SUPER hard) and if you weren’t sweating then it wasn’t worth doing. get elastic laces, practice transition, pump your tyres up, ideally get a TT bike.
you’ll do it! it’s just how fast.