Why do people say running is harder than cycling?

I saw this question in the running section, and I am wondering what the cyclists thoughts are (I am copying it word for word here so apologies to the original questioner):


cycling (at elite levels) is 100x more difficult than running in my opinion. i mean, TDF riders go 30+ mph CLIMBING THE FRENCH ALPS!!

people say the running:cycling ratio is approx 1:4, well in that case someone would need to run 500+miles at an extremely high speed to compare with TDF riders

i mean lance Armstrong ran the boston marathon. there is no way a a marathon runner could complete the TDF

no disrespect to runners, but cycling is so much more challenging, especially mentally
 
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