Manual de treino fisico para fortalecer costas e lombares, baseado no treino fisisco dos presos americanos.
Treino especifico para a zona lombar. Bom para costas, lombares e postura.
Dez passos (steps 1 - 10 ) para obter umas costas de ferro.
Instruções fáceis escritas e visuais (com a ajuda de um DVD).
Instruções em Ingles. Manual e DVD em Ingles.

Paul Wade’s Convict Conditioning Volume 4, Advanced Bridging: Forging an Iron Spine explodes out of the cellblock to teach you in absolute detail how to progress from the relative ease of a Short Bridge—to the stunning, “1-in-1,000” achievement of the Stand-to-Stand Bridge. Ten progressive steps guide you to inevitable mastery of this ultimate exercise for an unbreakable back.
This home-study course in ultimate survival strength comes replete with bonus material not available in Paul Wade’s original Convict Conditioning book—and numerous key training tips that refine and expand on the original program.