[freespirit]

Well, the main concept of this trainning method is good and should work wonders, in theory...but... even just walking apnea (at home, supermarket, etc), it tremendously dangerous, as you can black out, and, you never know how you gonna fall, even if you`re not alone, it can be fatal, and when i mean fatal, i`m not just talking about dying or something, but you can break you jaw, loose an eye, break your neck, even damage your trachea for example if you just fall over something you shouldn`t without guarding against the fall (cause you`re already falling uncounscious, remember...?) I think that`s fatal enough...

Why don`t you try to do some lying wheightinglifting, like resting on the floor with those ankle weights on your..ankles (lol) and wrists and do some repetitions kind of exercises for your back, this done over a thick smooth rubber mat shouldn`t represent no danger at all, and.. it`s f.... hard enough to do too, you just try it.
Besides that it trains you on the streamlined hidrodynamic position you will need for the real thing...

The much more different exercises we find to train the better, and it is really good exercise itself just to transpond other sports or activities to our own one, but we don`t really need to escape so much from our main goal just for method, or it will turn a bad and unoriented exercise, (and then waste of time, overtrainning, dangerous and, with no real gain or advantage...)

If you swim monofin, train hard monofin, if you spear , train hard stereofin, if you swim/dive as much streamlined as you can/should...why not to dry train for that, putting dynamic and static together in one...