In case you need 6 tips, here are the first 5 for running a marathon. Sonia, based at Loughborough, did 2:32.
https://youtu.be/qk2dObOpnuY
Last Updated on 16 January 2026 by the5krunner
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tfk is the founder and author of the5krunner, an independent endurance sports technology publication. With 20 years of hands-on testing of GPS watches and wearables, and competing in triathlons at an international age-group level, tfk provides in-depth expert analysis of fitness technology for serious athletes and endurance sport competitors.
