Here is an indoor class by ParkourGenerations :
Taught exclusively by Stephane Vigroux, Dan Edwardes, Forrest, Chris Keighley, Kazuma and Johann Vigroux, the indoor classes in London are offered as a supplement to the outdoor parkour training and focus largely on developing the physical attributes and functional strength and fitness necessary for parkour. Open to all, regardless of ability or experience, these classes are a great way to learn about your movement potential in a disciplined yet friendly environment. For more details and class times/locations see www.parkourgenerations.com
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“On r’met ça” is a good 
Slomo’ is another old famous 
An old 