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At least for soccer players, it comes down to a blend of two types of fitness - your base endurance, which comes from longer distance running, and your speed, which comes from sprint-based workouts.

Interview with Kim Tranell, www.seventeen.com. September 14, 2011.
At least for soccer players, it comes down to a blend of two types of fitness - your base endurance, which comes from longer distance running, and your speed, which comes from sprint-based workouts.