Olympic gold medallist for the US at the Sydney 2000 Games, Greene has traded in his running shoes for a Eurosport microphone as our athletics expert correspondent.
In the video above, Greene catches up with 'The Beast' Yohan Blake, whose efforts at London 2012 were only eclipsed by the Usain Bolt tour de force.
And below, Greene visits Shelly-Ann Fraser-Pryce, who claimed the women's gold in Stratford last summer over 100m, in search of insight into the 26-year-old's lesser-known side off the track.
Finally, we get tips and advice from Veronica Campbell-Brown on running a strong 200 metre sprint. The Clarks Town-born 31-year-old knows a thing or two about it, too: she won gold at both Athens 2004 and Beijing 2008, as well as at the 2011 World Championships in Daegu: