About: http://webisa.webdatacommons.org/154087643

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	From what I have seen, it is all about core and leg strength - most of time they are in that position where they are not sitting on the seat, but not standing straight up.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com