The utility model relates to a body builder which comprises a bourdon tube and a holding part. The bourdon tube is a spiral bourdon tube and comprises a main body part with a larger
diameter, a first end part which is positioned at one end of the main body part and has a smaller
diameter, and a transition part which is connected between the main body part and the first end part and has a
diameter gradually reduced from the main body part to the first end part, and an internal thread connecting hole is formed in the inner circumference of the first end part; the holding part comprises a holding
handle main body, a holding
handle front end part arranged at the front end of the holding
handle main body and a holding handle
tail end part arranged at the
tail end of the holding handle main body, the holding handle main body sleeves the first end part, the holding handle front end part sleeves the transition part, the holding handle
tail end part is provided with an external thread column, and the external thread column is inserted into the internal thread connecting hole and is in threaded connection with the internal thread connecting hole. According to the body builder convenient to disassemble and assemble, the hole shrinkage structure is adopted between the main body part and the first end part, the general design of the holding part is facilitated, and the body builder is comfortable and powerful to hold and not prone to loosening when used.