How to pronounce “callus”(noun) in English

If you start to callus, it means you're doing something wrong.

with exercise with calluses and splinters and dirt under our fingernails or grease or whatever.

Demonstrate your bunions and your calluses -- all those calluses you get when you run

And his point is that, I've got no calluses on my feet; neither does Ted.

If you're pushing back, you're pulling like that , you're going to have friction and you're going to callus.