Three-in-one fitness equipment

A three-in-one fitness equipment comprising:

• a weight box configured for receiving at least one weight plate;
• a first installation position provided on one end of the weight box, the first installation position being configured for installing a handle thereon;
• and
• a second installation position provided at a bottom of the weight box, the second installation position being configured for connecting to a rod-shaped holding member,
• wherein the fitness equipment is a kettlebell when the first installation position is installed with the handle, and the fitness equipment is a dumbbell or a barbell when the second installation position is connected to the rod-shaped holding member, the weight box comprises a box body, a box base detachably connected with the box body, a threaded rod on a center position of the box base, and a locking device arranged on the box body and configured for connecting with the threaded rod, an upper end of the threaded rod extends to an upper position of the box body, the box body is locked with the box base when the locking device is connected with the threaded rod, the threaded rod comprises an annular groove on an outer diameter position of the upper end of the threaded rod, the locking device comprises a lock tongue arranged around the threaded rod, the lock tongue is connectable to the box body, the lock tongue is rotatable around a center of the threaded rod and movable horizontally, an end of the lock tongue is insertable into the annular groove, the threaded rod is connected with the box body-when the end of the lock togue is inserted into the annular groove.