Have I exercised to Ayu's music? Yes.
Do I exercise to Ayu's music? All the time.
Her upbeat songs are perfect! Whether I'm riding my bike, jogging, dancing, I always have at least one song by Ayu in my workout routine.
I only wish we could have iPods in my summer school gym class. I'd definitely feel more motivated!
Songs I usually exercise to (bolded songs are perfect for me):
ANGEL'S SONG
Beautiful Day
BLUE BIRD
Born To Be...
(don't) Leave me alone
everlasting dream "Rainbow Dew Drop Mix"
evolution
glitter
HEAVEN "House Mix"
HONEY
Ladies Night (also ~another night~)
M "Above & Beyond remix"
Mirrorcle World
Naturally "Wippenberg remix"
Not yet (also "Xelakad Remix")
Startin'
WE WISH
WHATEVER -Dub's 1999 Club Remix-/Version M
So, as you can see, the songs I usually exercise to have a constant beat and are either upbeat or a remix.