Can I sub any IMAX for IMAX 3?

That's what I do. I think as long as you are working through the cycles at the right heart rate levels (aerobic then anaerobic then recovery, repeat), the workout is filling it's role in your rotation. I know that IMAX3 has shorter recoveries than the other 2 but at least for me, I don't think the difference is worth the price of yet another DVD. :)

Mel
 

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