If you want one thing to make you very sore, I would have to suggest pretending to be a frog.

Furthermore, if you have to do an interpretive speech, but aren't sure how to get started or just want practice interpreting characters, I would definitely have to suggest pretending to be a frog. Not only is it good practice, but it will pretty much take away all dignity you previously had. Better to get that out of the way rather than later.

Oh, and if you're looking to make an adorable little girl giggle, pretend to be a frog. Loosen up your legs, and bend them in a squat, make your eyes big, and talk in a deep voice. It's guaranteed to get a few giggles, and it will definitely be worth it... even if your legs are sore afterwards.

(Comment if you want me to explain the backstory behind this.)