20. Take that thing you bake bread with [you know, that round thing you make dough flat with]. Put it on table and roll your forearms over them. Then roll them over your shin. You got shin conditioner.

That would be a rolling pin

23. flat rock, out of the garden or off the beach, use to condition palms.

24. boil kettle, pour hot water into sink, place hands in water, usually done after 23, although if to hot wait until its only just bareable then place hands in water.
The way of the warrior is a resolute acceptance of death. -Musashi