How to practice mountaineering step

"Mountaineering step" is not difficult, left and right two feet in the palm of the foot, when the left foot with the palm of the foot down when the right foot naturally lifted, when the right foot with the palm of the foot down when the left foot naturally lifted, looks like a soft action is actually very hard, the two calves are particularly affected by the force. If you practice the next day feel sore calf stomach, then the action is right.