Use Ideal Terrain
For best results, try the parallel stop on a very smooth, flat surface
such as a hard tennis court. It is nearly impossible to do on rough terrain.

Avoid sliding
If you are tipping or sliding out to the inside of your stop,
you are dipping your inner shoulder. Keep it upright.

Avoid tipping
If you are tipping over to the outside of your stop, you may be applying pressure
too abruptly & throwing yourself over. Smooth out your pressure application,
keeping the majority of it on the inside edge of your outer skate.