The fist attack is not smooth, and the strength is mostly horizontal and contradictory. For example, kicking the leg and turning the waist to hit the right straight fist, the body takes a horizontal rotation trajectory. When you go forward with your right hand, you will definitely go back with your left hand. The strength of the right hand is forward, and the strength of the left hand is backward (because the strength is dominated by the waist and hip). In this case, the forward force of your right fist is similar to the backward force of your left hand. These two points in this power mode, the two fists in the same direction are of course not smooth.

However, if you don't use the way of left and right contradiction, it is possible to use double "fists" to attack smoothly, for example, the fist is held on the chest, the waist and buttocks don't move horizontally, but the leg strength comes up, and the spine stretches vertically to produce strength. At this time, the strength is vertical and contradictory, and the fists can be in front of each other at the same time in vertical strength, so even the fists can make heavy punches.

In fact, imagine a wooden board, which should be hit with both hands when placed horizontally in front of people, and punched forward with both fists when placed vertically in front of people. The first case is definitely better than the second. Let's take another example: a rattle. If you rub the stick under it to make it shake in a normal way, the two things next to it (I don't know what their names are ...) must be a forward and a backward, which is the contradiction between left and right. And if you don't wipe the stick, just hold the stick and swing up and down in the direction perpendicular to the drum surface, then the two things next to you can swing in the same direction, which is the contradiction between up and down.