Master Army Maguire of www.Agelesstrength.com demonstrates his iron palm training by demolishing a 2" concrete slab with his open palm. There are no gimmicks or fake bricks used in this demonstration. Iron palm training originated in Chinese martial arts and takes years of strenuous and extremely painful training but once mastered an "iron palm" can do unimaginable damage.
Army also shows his strength by bending a constuction nail in half:
You can contact Master Maguire for more info regarding this type of training: firstname.lastname@example.org