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Jim Davis/Globe Staff
Blake Evitt, an instructor with Parkour Generations Americas, led students up stairs during a morning session at Somerville High School.
Participant David Kovin ducked under a tree branch while running on a wall.
Daniel Abraham, Cristian Lopez, David Kovin, Blake Evitt, and Rachel Kelly negotiated railings
Blake Evitt lead students up stairs.
Rachel Kelly crawled up some stairs.
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