alastair, i've often thought about adding in an empty lung or two to my static or dynamic warmup. i use them in my cw warmup, and i like the fact that they take less time. my worry, after reading old posts by eric f, is that one might accumulate an O2 debt by going into deep tissue stores. his theory seemed to favour many sub-4 minute holds over a few 4min+ (or empty lung) holds where ones P.O2 drops quite low. i'm hoping he or anyone else could chip in here. cheers
bevan
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