Substitutions for Gym Style and STS Plyo Legs?

I want to do Cathe's Sept. rotation but I don't own Gym Style or STS. It should be OK to substitute Slow and Heavy for Gym Style (right?) -- but what should I sub for STS plyo legs? I do have Hardcore Extreme which has a few really tough leg drill workouts -- I think I'll sub in those. Advice appreciated!
-Caroline
 

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