If you want a good barre chord exercise

[Mick J]

Try this
http://www.youtube.com/watch?v=mv55WsedLYI

B-flat, G minor, C minor, A-flat.

When you get really good you can put in a few 7ths

Or you could cheat and capo on the 3rd fret. Play open position G, Em, Am, F.