If you're hanging onto the back of a car, how fast would it have to go before you were lifted off the ground? Plus, we ask about muscle cramp and how to avoid it! Like this podcast? Please help us by <a href="https://www.thenakedscientists.com/donate">supporting the Naked Scientists</a>

What are cramps and how does one avoid them?

Each week we set out to solve one of the world's weirdest, wackiest, funniest and funkiest scientific puzzles. And along with the answer there's a brand new question to think about for next time...