If your poolside bravado has ever inspired a painful and embarrassing belly flop, you know first hand that diving is hard. Not only does it take concentration and supreme body control, but it also requires some serious gumption. Especially when flinging yourself off a cliff located a near-hundred feet above a dive zone lined by jagged rocks and expectant onlookers. As you prep for a summer in the sun, we present some of the most jaw-dropping cliff dives we’ve seen and caution you to honestly evaluate your abilities before you spring for that Speedo you’ve been eying.