http://www.bbc.co.uk/iplayer/episode...the-space-race
How Russia Won the Space Race, BBC4, 13 Oct 2014
Available for 26 days.
BBC Iplayer may not be available for viewers outside UK.
The Russians did not know what the effects of space travel would be on the human body, therefore they trained their cosmonauts for extreme conditions, including running and swimming (in brief swimwear).