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From Fellrnr.com, Running tips
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This form will generate a [[VDOT Calculator|marathon pace ]] band. Some of the key options are:
* '''Safety Margin'''. If this is not zero then you will get three lists of split times
** '''Safe'''. The middle list is the safety margin splits. This list uses a slightly faster pace in the first half so you reach the 13.1 mile mark with the safety margin. From then on, you run the even splits to maintain the margin.
