My friend told me that XC makes you slow.

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Many college sprinters run XC to build strength and endurance.  Many top high school XC runners run under 4:30 for a mile, the best can run under 4:10!!.  That's 62.5 seconds per lap on the track, four times in a ROW!!  That's not slow, that's awesome.  XC builds strength and mental endurance.