Ultra running store: https://www.ULTRAmarathonRunningStore.com

Chia Charge flapjacks: www.chiacharge.co.uk

Northern Runner: www.northernrunner.com

Family run health products: https://www.hellenia.co.uk

Multidays: multidays.com

International Association of Athletics Federations: www.iaaf.org

Commonwealth Games Federation: www.thecgf.com

North York Moors Athletic Club: www.nym.ac

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

Park Run - 5km run series: www.parkrun.uk.org

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

Ultra Marathon Running: www.ultramarathonrunning.com

Running shoe reviews: https://www.runningshoesguru.com/

Running product reviews; https://thewiredrunner.com/ 

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