Go out as far as you can go on rides similar to the terrain you expect to encounter. As a general guide, then from there increase your mileage by 10-15% or so weekly but don't overdo it if you've been inactive for a while. Calculate that out to the event day and see what you have. You want to be able to ride at least 75% of your distance. Do some stretching and core work for good overall general maintenance.



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The first time I rode that same 5 miles with my 8 year old though, it took us well over an hour, so I didn't feel so bad for being slow.