Step back with the right foot in front, toes on the ground, and the left foot behind, full-palm on the ground, with the center of gravity in the forefoot position of the left foot, without leaning forward or backward.2 When the right foot passes over the left foot and steps back, and quickly follows the right foot to the right palm, with the left foot toes on the ground.3 When the left foot passes over the right foot and steps back, and shifts the center of gravity.4 When the right foot continues to pass over the left foot one step back but the center of gravity doesn't shift to follow the right foot, and the right foot continues to pass over the left foot and shifts the center of gravity to follow the right foot. The right foot lands on its half-pedal and the center of gravity remains on the left leg in front of it. At this point, the left leg retreats slightly until the knee of the right leg presses against the back fossa of the left knee, and the center of gravity follows the left leg between the legs, which are now natural, with the left leg upright and the right leg slightly bent.At 1 o'clock, the left foot presses on the ground to get a backward force, and the right leg goes backward, with the center of gravity arriving at the right foot in the rear. The next 2 time back the left foot, 3 time back the right foot, 4 time back the left foot, the center of gravity is not back, at this time, the right leg retreats to stick in front of the left leg, 1 time back the left foot.
Important note: the backward lock step movement is large and fluid. It is a major feature of cha-cha-cha, which is to play a role in connecting and exchanging footsteps left and right between dance steps. Thus enhancing the artistry of the dance, the knees are exposed when jumping, forming a Latin cross posture.