i ordered the HSC because I posted something about htem asking which one everyone perfered and which one I should buy. They're both almost the same intesity. Everyone seemed to say that HSC was better and more fun, and the music was a lot better. They both use cardio and muscle training. I suggest you get HSC first, and later if you want, you an get HST.
Hope this helps,
~Adri;-)
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