What is the relationship between Beachbody and fitness in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

Mark is a born fitness enthusiast and is currently working with fitness expert Tony Horton and Beachbody showing people how to stay in shape with the "10-Minute Trainer" program.Mark boasts a list of accomplishments in his professional career.

Answer: industry