A washboard or old plastic bathtub are put on the ground, on the shop a few scree (cobble) , smooth foot is above slow fast place runs, day Leng Ke wears soft sole or thick sock.

• 地上放一块洗衣板或旧塑料澡盆，铺上一些小石子（鹅卵石），光脚在上面慢速原地跑，天冷可穿软底鞋或厚袜子。