Hmm the beans don’t normally get stuck and there really isn’t a ton of resistance, so I wouldn’t call it strenuous. It feels like maybe the amount of forced to scrub a dish kind of hard. It’s not difficult, but the time it takes can be tiring if grinding a whole pot. 

https://i.postimg.cc/R0mqL1H5/IMG-0022.jpg

It looks like a cast iron burr that fans out over a dome shape

I’ve only tried it the one time so far but doing at a moderate pace that wasnt making me sweat and the finest granule setting was about one minute for 15g.