i remember bill grant telling me that also about sergio doing alot of partials, bill said arnold started adding it into his workout also after arnold went to chicago and trained with sergio.bill said he and arnold would start back off with chins,but not the regular way,arnold would put a bench under the chin bar and he and bill would take turns starting their sets from the top position and going only HALF WAY DOWN and then back up again. after 5 sets of that arnold and bill would start their chins from the hanging position and only go HALF WAY UP and then back DOWN to the full stretch position. after 5 sets that way they would do full complete sets of chins for 5 sets,bill said they used additional weight hanging from a dip belt when they did the half chins.bill said arnold picked that up from sergio if i remember correctly
