Abstract: An extendable stick having an outer pipe, an inner pipe, a core bar fixed on the outer pipe, a zigzag chain having a first portion and a second portion, an unlocking pipe, an unlocking member attached to one end of the unlocking pipe, an unlocking pin, and an unlocking finger grip attached to the unlocking pipe through a hole in the inner pipe by means of the unlocking pin, wherein the first portion being fixed to the inner pipe, the core bar running through the zigzag chain. The stick can optionally have a pedal and/or a spring to provide force to stretch the zigzag chain.