it does.. seriously.. my ab muscles have tightened
significantly.. usually we use a bunch of muscles but the core
muscles are not used... those are the muscles being worked...
i would say that cycling for an hour makes me sweat a lot.. but
ultimately, it's not really taxing.. however, this pilates for an
hour, makes me ache..
'sides, i was told to do this coz of my messed up back.. this
allows me to relearn and strengthen my back so that i'll not be
crippled as early 
