1, packaging dumbbells

The rubber-coated dumbbell is provided with a rubber combination structure on the surface of the bell head, and the combination structure is convex or concave, so as to increase the surface area of the bell head and rubber combination and increase the combination strength.

2, electroplating dumbbells

The whole body is made of cast iron, hard, thick and dense, and the dumbbell surface is electroplated.

Second, the volume is different.

1, packaging dumbbells

The rubber-coated dumbbell is slightly larger. When you practice heavy dumbbells, the excessive volume may hinder the movement.

2, electroplating dumbbells

Electroplated dumbbells are small in size.

Third, advantages and disadvantages

1, packaging dumbbells

The advantage is that it can't break the floor; The disadvantage is that it smells like plastic, and the quality is not good and it is easy to drop slag.

2, electroplating dumbbells

The advantages are smooth surface, no rust and no discoloration; The disadvantage is that it is easy to break the floor.

Four, other types of dumbbells

1, plastic-impregnated dumbbells: Generally, plastic-impregnated dumbbells are not selected for heavy ones, and the plastic-impregnated facade is easy to rust.

2, painted dumbbells: similar to electroplated dumbbells, small size, not easy to rust.

Extended data:

The benefits of practicing dumbbells

1, long-term practice of dumbbells can modify muscle lines and increase muscle endurance. Regular heavy dumbbell exercises can make muscles strong, strengthen muscle fibers and increase muscle strength.

2, can exercise upper limb muscles and waist and abdomen muscles. For example, when doing sit-ups, putting dumbbells behind your neck with both hands can increase the load of abdominal exercises; Lifting dumbbells to do lateral bending or turning exercises can exercise the internal and external oblique muscles of the abdomen; Keep your arms straight forward and lift dumbbells sideways to exercise your shoulder and chest muscles.

3, can exercise lower limb muscles. For example, squat with dumbbells on one foot and jump with both feet.

Baidu Encyclopedia-Dumbbells (Simple Equipment for Strengthening Muscle Strength Training)

Baidu Encyclopedia-Packaged Dumbbells

Baidu encyclopedia-electroplating dumbbells