Russia's athletics head coach Valentin Maslakov has resigned following the doping scandal in his country.
Alistair Brownlee says recent failed drugs tests linked to contaminated supplements highlight the problems facing elite athletes.
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Athletics Video & Audio
- Watch video I am a victim, not a cheat - Williams
- Watch video Women's rugby star turns to athletics
- Watch video At home with Jo Pavey
- Watch video Forgotten sporting moments from 2014
- Watch video GB women dominate Euro cross country
- Watch video Russia doping claims damaging - Coe
- Watch video Doping claims 'alarm' Meadows
- Watch video Wilkins wins Unsung Hero South award
- Watch video Pavey not surprised by funding cut