Muscle fitness equipment

The utility model discloses a muscle body builder which comprises a round rod, two first screw rods, a connecting rod, a positioning frame, a first limiting assembly, a second baffle ring, a fixing assembly and a second limiting assembly, and the two first screw rods are fixedly installed in the centers of the left side and the right side of the round rod respectively. The connecting rod is in threaded connection with the outer wall of the first screw rod through a threaded cavity in the inner side of the connecting rod, the inner side of the connecting rod is attached to the round rod, the outer wall of the connecting rod is sleeved with three dumbbell pieces from inside to outside, and the upper end and the lower end of the inner wall of each dumbbell piece are each provided with an inserting groove; the two positioning frames are fixedly installed on the left side and the right side of the upper end and the lower end of the round rod respectively. The two first limiting assemblies are fixedly installed on