Beach exercise!

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Does anyone have any fun exercises to do on the beach? For the last couple months I've been running up and down stairs, doing pushups in the sand, dips on the benches, and waking (and some playing) in the ocean. I've seen some intense cross fit type routines for the beach on some websites; they seem a little intense for me, but I intend to try them since I don’t care about looking like an idiot out there, but I want to know what you guys do to give me some more ideas on fun ways to modify the workouts. Happy summer!