Damn, I want a bag of sand! A great way to condition yourself and work also as a punching bag and a throwing pal. But when the whole bag of sands tears up you have endless amount of sand on the floor of your apartment lol.
Anyone actually have one? Looks like an excellent way to train and condition yourself.
Btw, found a great article about sandbags
http://www.t-nation.com/free_online_article/most_recent/sandbags_for_strength