About: http://webisa.webdatacommons.org/162401131

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Because the mental toughness is the most difficult to build; it does take time and effort, and cannot interfere with other necessary mental skills of a professional athlete.
http://www.w3.org/ns/prov#wasQuotedFrom	run-down.com