A dip bar is a piece of fitness

Physical fitness

Physical fitness comprises two related concepts: general fitness , and specific fitness...

 equipment that consists of a U-shaped bar, usually about 1" (2.5 cm) in diameter, which surrounds the user's body at the waist.

Overview

The user grips the dip bar with both hands, and supports their body weight on it. The exercise may be performed in conjunction with the user wearing a dip belt and additional weight to increase resistance.

The exercise

Dip (exercise)

The dip is an exercise used in strength training. Normal, shoulder-width dips primarily train the triceps, with major synergists being the anterior deltoid, the pectoralis muscles , and the rhomboid muscles of the back...

 is performed by raising and lowering the body using the triceps

Triceps brachii muscle

The triceps brachii muscle is the large muscle on the back of the upper limb of many vertebrates. It is the muscle principally responsible for extension of the elbow joint .-Terminology:...

, chest

Chest

The chest is a part of the anatomy of humans and various other animals. It is sometimes referred to as the thorax or the bosom.-Chest anatomy - Humans and other hominids:...

, rhomboid

Rhomboid major muscle

The rhomboid major is a skeletal muscle on the back that connects the scapula with the vertebrae of the spinal column. In human anatomy, it acts together with the rhomboid minor to keep the scapula pressed against thoracic wall and to retract the scapula toward the vertebral column.-Structure:The...

, and deltoid

Deltoid muscle

In human anatomy, the deltoid muscle is the muscle forming the rounded contour of the shoulder. Anatomically, it appears to be made up of three distinct sets of fibers though electromyography suggests that it consists of at least seven groups that can be independently coordinated by the central...

 muscle

Muscle

Muscle is a contractile tissue of animals and is derived from the mesodermal layer of embryonic germ cells. Muscle cells contain contractile filaments that move past each other and change the size of the cell. They are classified as skeletal, cardiac, or smooth muscles. Their function is to...

s. By leaning forward the user can work the chest more and the triceps less. Conversely, by keeping the body upright, the triceps are worked to a greater extent than the chest.