This looks insane. Two dudes doing trials-bike stunts around London on Boris Bikes? Nutters!

Closer inspection reveals that the bikes are in fact just customised to look like Boris Bikes - the real things weigh about as much as a Sherman tank and would be nigh-on impossible to manoeuvre like this - but it's still bloody impressive.

The video, which also includes free-running, was produced as a promo for a new app called Fightme, which encourages people to "join in challenges and create their own".

It sounds interesting, though I have to say this is one challenge I won't be taking up...

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