Actress Lyssa Roberts -- Skateboard 101 ... I Got My Backside Down (PHOTO GALLERY) Actress Lyssa Roberts Skateboard 101 I Got My Backside Down EXCLUSIVE 9/14/2016 12:20 AM PT

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Actress Lyssa Roberts -- the Wimbledon streaker from "7 Days in Hell" -- has at least part of a backside grab mastered.

Not hard to figure out which part, once you take a look at her coasting along the Playa del Rey beach boardwalk.

Come to think of it ... she could go pro.

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