Some time ago I posted the testing procedures to determine fiber type: the one recommended by AJ/Darden and another one by IART. I did those tests multiple times with various equipment in order to check myself and those tests never failed to confirm the conclusions which I made just watching how my different muscles reacted to various reps schemes. At least, on that points (that you can determine fiber type without biopsy and that you need to train in accordance with your fiber type) I fully agree with AJ. Although, Jones said several times that he knows for sure how fast-twitch muscles need to be trained, but he is not so sure how slow-twitch muscles should be trained. I speculate that he thought that slow-twitch muscles need more volume & frequency and not just higher rep count (15-20) in one all-out set.
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