Can anyone recommend a good, challenging pilates dvd? I've done MTV pilates in the past, but I lost it and I'm looking for something that will give me more visible results.

Oh and I don't have an exercise ball :/

Breaktthru Pilates Sculpt is a really good one. You just need light weights. It's not traditional pilates moves but is very challenging!

Id Recommend any of the Stott pilates videos. Its a slightly modified version of pilates. My sister inlaw own a studio that holds stott classes and I've seen tons of results! http://www.stottpilates.com/