I don't know if I have the latest one but I have looked at the NAUI breathold manual, dated 1997. It is mostly talking about physiology but the training techniques and recomendations are a joke. From what I gather it's mostly taken from a training course from Pipin but draw some strange conclusions. One example is " the first breathold imersion of the day will be as long as the last breathold from the previous day"
ie if you did 3.00, 4.00 and 5.00 on day1, then on day2 you should start on 5.00 ?!
Some other really stupid stuff includes, don't do a static longer then 6 minutes.....Don't ever do more then 8 minutes total bottom time in one diving session. :duh
Setting a time or depth limit is just plain stupid, some people will blackout before even reaching 3.30, others can do 7, 8 or more cleanly. If the PADI stuff is anything like NAUI I wouldn't touch it with a 10ft pole.
Cheers,
Wal