In the Baji system, there are 3 different Fajin.
1. 沉墜勁 sinking power - stand both feet on your toes, sink your body to the ground and then send your downward punch out.
2. 十字勁 expending power - stand in bow-arrow stance, stand on your toes, send your cross punch out as far you can. When you can't go any futher, pull your punch back and send your other punch out.
3. 纏絲勁 twisting power - This is the most difficult one to generate. It's similiar to 十字勁 expending power but you let the power to sorround your body and then send it out.