I agree, as long as the area you can work in isn't full of holes or other things that could injure the horse (obscure ruts, that sort of stuff); you will be fine. Uneven terrain in and of itself will keep the horse more focused on actually picking up his feet, and carrying himself well, rather than just plodding along lazily.
If alot of people knew some of the areas I have lunged my horses they would probably think I'm next to cruel...incidentally I never have a horse refuse to go over anything, ever, even if he's never faced it before; I use embankments, ditches, little creeks, logs in paths, etc, all to my advantage when they happen to be in the area I am working in. There is alot you can do to keep your groundwork both interesting and beneficial.
"The ideal horseman has the courage of a lion, the patience of a saint, and the hands of a woman..."
Last edited by mom2pride; 10-18-2011 at 12:50 AM.