I see... Maybe I can use my Lowepro Slingshot slung in front to approximate the usage of a large belly in this case...
I think no need tummy lah... only saying half in jest. Just tug your elbow close to your body and hold your breath. I must add that the Bigma at 1.8kg does feel heavy after 1 hour. A monopod will go a long way to help hold the weight and achieve sharper shots. Although personally I can't get used to using a monopod.