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This Saturday, evian is turning the urban beach at Beekman’s Garden into the city’s hottest workout venue.

Celebrity trainer Jackie Warner (star of Bravo’s “Thintervention” and author of 10 Pounds in 10 Days) is teaching the toning-and-cardio workout—and the fitness guru is taking questions, so Tweet us yours!

Ask her anything—from how much protein you need post-workout to how to build long, lean muscles.

Here’s how to get Jackie your question:

Tweet your question using the hashtag #AskJackie and tagging @evianwater anytime now through Saturday at noon, and she’ll answer your question at the event or on Twitter.