== Privatliv ==
Arndt er åbent homoseksuel og var i længere tid partner med [[Petra Rossner]],<ref>{{kilde | url =  https://www.abc.net.au/news/2004-08-16/german-cyclist-arndt-livid-over-exclusion-of/2026710 | titel = German cyclist Arndt livid over exclusion of lesbian lover | udgiver = abc.net.au | dato = {{dato|16-8-2004}} | bureau = AFP | hentet = {{dato|1-4-2023}} }}</ref> og parret blev ambassadører for Gay Games i 2005.<ref>{{kilde | url  = https://www.cyclingnews.com/news/rossner-and-arndt-become-gay-games-ambassadors/ | titel = Rossner and Arndt become Gay Games ambassadors | udgiver = cyclingnews.com | dato = {{dato|9-6-2005}} }}</ref>
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