erm...crunches are better than situps.
and sometimes tummy is caused by stress and toxic buildup. if its
this kind (erm...i forgot how to tell if its the stress kind), then
no matter what exercise you do, you cant really get rid of it. you
have to lower your stress levels and toxic levels.
(erm...and dont ask me how cos i have forgotten 
)
but oh well, just exercise and eat more healthily. and less stress
lah.
