Oh, I mostly play with the v6, because I don't care too much for the hermit, and from "reaction_masterwork2.txt"
[REACTION:WORK_OUT1]
[NAME:Work out]
[BUILDING:TRAINING_DWARF:CUSTOM_A]
[BUILDING:WEIGHT_SET_KOBOLD:CUSTOM_A]
[PRODUCT:100:10:BOULDER:NONE:INORGANIC:SWEAT]
[SKILL:MISC_WEAPON]
[REACTION:WORK_OUT2]
[NAME:Work out - Medium (Any Metal Bar)]
[BUILDING:TRAINING_DWARF:CUSTOM_B]
[BUILDING:WEIGHT_SET_KOBOLD:CUSTOM_B]
[REAGENT:A:150:BAR:NONE:INORGANIC:NONE][REACTION_CLASS:IS_METAL]
[PRODUCT:100:1:BAR:NONE:GET_MATERIAL_FROM_REAGENT:A:NONE][PRODUCT_DIMENSION:150]
[PRODUCT:100:20:BOULDER:NONE:INORGANIC:SWEAT]
[SKILL:MISC_WEAPON]
[REACTION:WORK_OUT3]
[NAME:Work out - Hard (Lead Bar)]
[BUILDING:TRAINING_DWARF:CUSTOM_C]
[BUILDING:WEIGHT_SET_KOBOLD:CUSTOM_C]
[REAGENT:A:150:BAR:NONE:INORGANIC:LEAD]
[PRODUCT:100:1:BAR:NONE:GET_MATERIAL_FROM_REAGENT:A:NONE][PRODUCT_DIMENSION:150]
[PRODUCT:100:30:BOULDER:NONE:INORGANIC:SWEAT]
[SKILL:MISC_WEAPON]
It's a bit odd, I really thought that 6.1 was just adding the hermit, but apparently, other changes had been made.