Hi. What didn't impress you about BodyMax? Was it not challenging enough cardio-wise, or was the choreography too simple, or what? It will be easier to reccomend videos if you tell us what you are looking for in a video.
If you are looking for challenging choreography, then I can see being a bit disappointed in BodyMax. Although it is one of Cathe's toughest overall workouts IMO, and I really like it, it is not one with the most challenging choreography. Of those videos of Cathe's which I own, I would say I like StepWorks the best for challenging myself both choreographically AND cardiovascularly. It was my first Cathe after TWV, which I don't really enjoy. (The Wedding Video)
After that I would say Rhythmic Step is satisfying for pretty complicated choreography, but not AS challenging to the lungs and heart (still tough though!)
If you just want a healthy chunk of tough aerobic conditioning, with relatively simple choreography, I would say Imax, PowerMax and any of the CTX series would fit the bill.
StepFit would be last on my list (again, just out of the ones I own). It's fun, but has a bit too much whooping for me.
If you want to branch off from Step a bit, I would reccommend Cardio Kicks as a real toughy--again, not complex moves, but you will be sweating buckets if you give it your all.
Of course, as you know, stepping isn't going to give you muscles, and 5'8" and 135 pounds is certainly lean enough!! If you are looking to develop strength look no further than this site, where you will find the best strength training tapes available!!
Hope this helps,
Wendy
Hope this helps somewhat
Wendy