Stair climbing
…back down stairs, even though it's the safest it is also the most cognitively difficult descent strategy. On 28 September 2014, Christian Riedl climbed Tower 185 in Frankfurt, Germany 71 times in 12 hours for a total of 43,128 ft (13.14 km). From 5–6 October 2007, Kurt Hess climbed Esterli Tower in Switzerland…