Vacuum spring tube type chest developer

The invention discloses a vacuum spring tube type chest developer, and relates to the technical field of sports equipment. The vacuum spring tube type chest developer comprises pull rings, pull rods, sealing end covers, O-shaped sealing rings, a spring tube and the like. The vacuum spring tube type chest developer is characterized in that the sealing end covers are arranged at two ends of the spring tube, the pull rings are connected with the pull rods, the pull rods are connected with the sealing end covers, and each O-shaped sealing ring is arranged at an end of the corresponding pull rod in the spring tube. The vacuum spring tube type chest developer has the advantages that tension of the vacuum spring tube type chest developer is mainly generated from internal and external atmospheric pressure difference of the spring tube, the magnitude of the tension of the vacuum spring tube type chest developer is mainly determined by the cross sectional area of the spring tube, accordingly, the tension is quite gentl