Sentence:  Tailback James Saxton already has surpassed his rushing total for his brilliant sophomore season , when he netted 271 <WSD>yards</WSD> on 55 carries ; he now has 273 yards in 22 tries during three games . 
Meaning of the word marked with <WSD> tags:  a unit of length equal to 3 feet; defined as 91.44 centimeters; originally taken to be the average length of a stride