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https://www.lfgss.com/comments/12901124/
So you were already 78kg when you started running to work. I'm 95kg.
Put 17kg in a backpack and run 12k and let me know how you feel.
I think the larger difference is at lower intensity- when I switched from cycling my commute to running it I was taking conference calls during my run, which should give you an idea of intensity, yet the weight absolutely fell off me.