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any advice on how to train/get started would be great
For training, JFGI. There's more than enough advice out there, for TTing it largely comes to a consensus around intervals just above threshold.
For getting started, find the club which runs weekly evening 10s near you and join them. If we actually get any events this year, ride the evening 10s on your Isen. This has two advantages; you'll beat a few people on plastic spaceships, which is always fun, and you'll find out how far down the rabbit hole you want to go.
So I've just done a 24.35 10m on my isen, on an unofficial course by the A11 in Norfolk with alot of roundabouts. I've got a giant trinity (old style) but am struggling with the fit so have just been using it sparingly on the turbo. Should i wait to get a bike fit and follow a training plan indoors in the meantime? Does anyone know a good plan? I'm very green to time trials so any advice on how to train/get started would be great