There are no tricks. Mine empties as soon as I sit no pushing necessary since it is muscle controlled and no rectum but I have eard some folks say that you may need to sit straight up so the pouch is staright and let gravity do its thing. If you slouch when you sit that may be the problem.

Folks have different approaches. Some of them were described in the brilliantly-titled thread called "Bathroom Yoga"

Bathroom Yoga

Coughing hard while sitting on the throne. That cleans me out!

If everything is working properly, it should just come right out with minimal pushing. The only time I had difficulty and had to strain was when I developed an anal stricture that needed dilation.

A friend turned me on to this, try lifting your knees up towards your chest while on the toilet. Basically, you are trying to imitate a squatting position instead of a sitting position.

His theory is that it positions your body correctly for evacuating your bowels. I think he uses a ball on the bathroom floor to elevate his legs.