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I've started running practice half-marathons and I've found Runkeeper on Android really useful to keep me up to date with my time/distance/pace throughout the run.
What's quite annoying though is that I'm never quite sure when I've got to 21.1km which leads to a lot of fiddling with my phone.
I don't think there's any way to get Runkeeper to stop at this distance automatically. Anyone know a way around this, or another app that does this?