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I am currently training for my first marathon (Kielder!) and have some 3 month old Mizuno Wave Inspire 7's which seem to be suiting me well, these were purchased from a specialised running shop following gait analysis. I would like to purchase an additional pair of trainers for when mine are wet/muddy etc would it be ok to train in the Mizuno 7's and 8's if I were to purchase the 8's I have been looking to buy from the internet, saving a bit of money and the 8's seem to be an improvement on the 7's? Hope that makes sense! Thank you for your advice