Hello @Jillibeeen, welcome aboard to our community. You can use your Surge for a marathon, however is not possible to configured one on it, so your tracker let you know its time to walk or run. Note that the surge does not have push notifications or reminders to move integrated.
What you can do is configured a Silent alarm at specific time to remind you to do exercise. Its the only workaround for this I can think of. Although I invite you to visit the Feature request board and share your idea.
There is another user who have suggested to implement split tracking for marathons that might be of your interest. If it does, you can share add your comments and vote for it in the following link:
5K/10K/Half Marathon/Full Marathon Split Tracking.
Hope this helps and see you around.
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