Nike + Training

Hurricane_C
Hurricane_C Posts: 806 Member
edited December 17 in Fitness and Exercise
Hey guys,
I'm trying to do the Nike+ 5K training since I've completed my c25k ... I just had a quick (and probably stupid) question for those who have used it before... when it shows how much you're supposed to run (ie: 2 mi) under it there is "15 GS" or "10 GS" ... what does that mean?

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