Runner World magazine: www.runnersworld.com

Multidays: multidays.com

International Association of Athletics Federations: www.iaaf.org

Commonwealth Games Federation: www.thecgf.com

Commonwealth Championships 2009: www.cumbriacommonwealthchampionships.org

North York Moors Athletic Club: www.nym.ac

Spira running shoes: www.spirafootwear.co.uk

International Association of Ultrarunners: www.iau.org.tw

Park Run - 5km run series: www.parkrun.com

Centurion Systems: www.centurion-systems.co.uk

Ultra Marathon Running: www.ultramarathonrunning.com

Mannatech: www.mannatech.com

Logan Beaulieu (Canadian ultra-runner): www.logansrun.ca