Hey Vinnie
I have some guides to BtVS and after looking in them I can only come up with this:
"The music BUffy uses for her callisthenics: the riff sounds like the KLF's 1991 hit '3 AM Eternal'; however it's a common sample and it could be almost anything."
From Slayer: The Revised and Updated Unofficial Guide to BtVS by Keith Topping
I'm afraid thats the best I can come up with by hopefully someone else will come up with a more conrete answer for you.
I have some guides to BtVS and after looking in them I can only come up with this:
"The music BUffy uses for her callisthenics: the riff sounds like the KLF's 1991 hit '3 AM Eternal'; however it's a common sample and it could be almost anything."
From Slayer: The Revised and Updated Unofficial Guide to BtVS by Keith Topping
I'm afraid thats the best I can come up with by hopefully someone else will come up with a more conrete answer for you.