长拳的劲力要顺达。如果发力不顺，也会使动作僵硬、死板。长拳运动最忌“僵劲硬力”，强调“力要顺达”。用力顺达，须从“三节”、“六合”着手。三节，即梢节、中节、根节。以上肢来说，手是梢节，肘是中节，肩是根节。以下肢来说，脚是梢节，膝是中节，胯是根节。六合，即内三合与外三合。内三合指心与意合，意与气合，气与力合；外三合指手与足合，肘与膝合，肩与胯合。又有眼、心、意、气、功、力六个方面的配合，还有以手、眼、身相合为外三合，精、气、神相合为内三合。掌握好“三节”、“六合”动作才会流畅。
In Chang Quan exercise，the strength must be smooth.Otherwise the movement will be rigid and inflexible that which is a taboo of Chang Quan exercise.For the effect of flexible and smooth strength，the exerciser shall pay attention to“Three parts”and“Six conformities”.The“Three parts”refer to the end part，the middle part，and the root part.For the upper limbs，the end part refers to hands；the middle part is elbows，and the root part means shoulders；for the lower limbs，the feet are the end part，the knees are the middle part，and the hip joints are the root part.Six conformities means the three external conformities and the three inner conformities.The three inner conformities refer to the coordination between the heart and the intention，the intention and the breath，the breath and the strength；the three external conformities refer to the coordination between the hands and the feet，the elbows and the knees，the shoulder and the hip joints.Another understanding of the“Six conformities”is the coordination between such six aspects as the eyes，heart，mind（intention），breath，skill and strength.Other understandings regard the coordination of hands，eyes and body as the three external conformities，and the coordination of vigor,breath and spirit as the three inner comformities.A good command of the“Three parts” and the“Six conformities”is the requirement for smooth strength and movement.