A hand-held exercise device is disclosed. The exercise device includes a series of bell-shaped connectors. Each of the bell-shaped connector includes a spherical head and a spherical receiving cavity. The series is formed by rotatably coupling the spherical head of one bell-shaped connector to the receiving spherical cavity of another bell-shaped connector. The series of bell-shaped connectors is covered by a sheath for protection. A first end of the series of bell-shaped connectors has a spherical head in order to rotatably couple to a first handle having a coupler located at one end of the first handle. Similarly, a second end of the series of bell-shaped connectors has a receiving cavity in order to rotatably couple to a second handle having a coupler located at one end of the second handle.

A hand-held exercise device is disclosed. The exercise device includes a series of bell-shaped connectors. Each of the bell-shaped connector includes a spherical head and a spherical receiving cavity. The series is formed by rotatably coupling the spherical head of one bell-shaped connector to the receiving spherical cavity of another bell-shaped connector. The series of bell-shaped connectors is covered by a sheath for protection. A first end of the series of bell-shaped connectors has a spherical head in order to rotatably couple to a first handle having a coupler located at one end of the first handle. Similarly, a second end of the series of bell-shaped connectors has a receiving cavity in order to rotatably couple to a second handle having a coupler located at one end of the second handle.

The invention relates to the technical field of rackets, and discloses a preparation process of an improved racket, which comprises the following steps: step one, taking a carbon fiber plate or a glass fiber plate, sewing and bonding the carbon fiber plate or the glass fiber plate on an integrated solid EPP material through colloid, and pressing again through pressure equipment; Step 2, the pressed primary product is made into the external structural shape of the required racket by a cutting machine, and it is cleaned; Step 3, put the cleaned racket prototype into a UV printer to draw the surface pattern or attach the surface with water marks. By adjusting the internal material of the racket to the integrated solid EPP material, the prepared racket can be prevented from being deformed, and at the same time, the elastic performance is improved.

The invention relates to the technical field of rackets, and discloses a preparation process of an improved racket, which comprises the following steps: step one, taking a carbon fiber plate or a glass fiber plate, sewing and bonding the carbon fiber plate or the glass fiber plate on an integrated solid EPP material through colloid, and pressing again through pressure equipment; Step 2, the pressed primary product is made into the external structural shape of the required racket by a cutting machine, and it is cleaned; Step 3, put the cleaned racket prototype into a UV printer to draw the surface pattern or attach the surface with water marks. By adjusting the internal material of the racket to the integrated solid EPP material, the prepared racket can be prevented from being deformed, and at the same time, the elastic performance is improved.