Bibliography all your references https://www.mytendon.com/en/tendon-master-9-7-green/p-360/ https://www.bergfreunde.eu/fall-factor-calculator/ Amca AM, Vigouroux L, Aritan S, Berton E. The effect of chalk on the finger-hold friction coefficient in rock climbing. 2012. doi:10.1080/14763141.2012.724700 Bright CM. A History of Rock Climbing Gear Technology and Standards. 2014. Accessed November 23, 2020. http://search.ebscohost.com/login.aspx?direct=true&db=edsbas&AN=edsbas.1CBA29F7&site=eds-live https://gripped.com/indoor-climbing/new-climbers-guide-using-climbing-chalk/#:~:text=Chalk%20is%20something%20used%20to,dry%20to%20provide%20better%20grip.&text=Everyone%20from%20new%20to%20pro,route%20where%20a%20chalk%20bag.