Are you sure? This is not the weight or the shape reason?

I process every kinds of the paper by my 2 hands the last 10 years.

I process per 4 limbs I say I walking that UB 4 block or here 4 block, both coming back 8 block in total. Meaning on your "foot miles", that is the Chinese words say. 

I am inside my own room....

https://www.youtube.com/watch?v=4ofOy99q2Kc