I have a 25lb and 35lb "Iron Core" KB-- those things are really killer at 1st.

I do notice now, I feel like one big muscle-- instead of just strong extremities its all strength integrated together reptilian fashion, like a snake. I also have less problems with backache and my shoulder problems have cleared up. I have trained with free weights for many years, but its not the same. Its a great fat burning routine if you can stand it.

for the uninitiated ...

http://www.theothersideofstrength.com/db_KBells.aspx

http://www.youtube.com/watch?v=gy5u...feature=related

http://www.kettlebellsscotland.com/homepage.htm