前交叉、中交叉和后交叉是自由泳的三种技术类型,主要体现为双臂在运动轨迹中的交汇。在这里给大家做一个简单的介绍,说说它们的不同之处。众所周知自由泳是手臂从水面移臂在水下划水,并且两只手臂不断交替进行的一种泳姿。前交叉是指在自由泳的游进过程中,在水面移臂的手臂与水下划水的手臂交叉点比较靠前的一种技术(一般在手臂前伸的小臂位置)。这种技术的动作特点是每次划水前都会把手臂尽量前伸,前伸后有相对的停顿动作,划水路线相对较长,并且每次动作 Pre-cross, mid-cross and post-cross are three types of freestyle technology, mainly reflected in the intersection of the trajectory of the arms. Here for everyone to make a brief introduction, talk about their differences. As we all know, freestyle is an arm swinging arm from the water under the water, and the two arms alternating alternately a swimming position. Pre-cross refers to the free-swimming in the process of swimming, arm in the water and arm under the water paddle crossing the more front of a technology (usually arm forearm position). The action of this technique is characterized by the fact that the forearm stretches as far as it can before each stroke, with relative pause actions after the stretch, a relatively long stroke of the waterline, and each action