This is a terrific look at Chris Boardman going deep into the hurtbox as he attempts to break the World Hour Record. This from YouTube…
The hour record is the ultimate solo effort in cycling. There are no rivals, tactics or terrain to influence the outcome — just 60 minutes of suffering to try to ride further than anyone has before. Boardman has done it twice, in 1993 and 1996. His 1996 ride, 56.375 kilometres, is the current world record — and it may stand forever.
It is a lengthy video, but well worth a look.