I see Amazon in the UK has this book:
"Manual Of Freediving: Underwater On A Single Breath (Freediving)"
by Umberto Pelizzari, Stefano Tovaglieri
Anybody out there know if this book if any good? Does it have any practical relevance to spearfishing? Over the years I have learnt many things from books but I was planning to learn spearfishing hands-on ... to get away from books (that said, this forum has been an incredible living resource).
[USA link (more reviews): "Manual Of Freediving: Underwater On A Single Breath (Freediving)"]