In the taut thriller The Shallows, when Nancy (Blake Lively) is surfing on a secluded beach, she finds herself on the feeding ground of a great white shark.  

Though she is stranded only 200 yards from shore, survival proves to be the ultimate test of wills, requiring all of Nancy's ingenuity, resourcefulness, and fortitude.

The Shallows: Best Surfing Scene (Blake Lively)