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In 2006 , Mike King , a former BMX and mountain bike racer , then director of BMX for USA Cycling , urged her to return to BMX riding , and in 2007 she did so , with the added prospect of possibly participating in the 2008 Summer Olympics Jill came out of BMX retirement in early 2007 ostensibly to supplement her mountain cross training .
 Mike King, USA Cycling, Jill
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mike King, USA Cycling, Jill