Abstract: A hand guard sleeve for an elastic belt with an opening comprises a gripping part which can be held by a trainer with one hand or both hands, and fan ears integrally formed on two sides of the gripping part, wherein the gripping part is provided with a first opening along a length direction, and the fan ears are provided with a second opening, the first opening and the second opening are connected with each other in a straight line, the second opening is wide outside and narrow inside, and the inner dimension of the second opening is matched with the first opening; the hand guard sleeve can be quickly combined with the elastic belt, that is, the elastic belt can be stretched and then put into the second opening and the first opening, so that the hands of the trainer can be protected during use, and the hand guard sleeve can also be used for vertical exercises, that is, the elastic rope is vertically pulled up and down, so that the training modes are more diverse.

Abstract: A double-safety anti-dropping and anti-fracture hook for an elastic belt comprises a main hook body, wherein a small end of the main hook body is provided with a first connecting hole, a big end of the main hook body is provided with a second connecting hole, the second connecting hole runs through the main hook body in a radial direction, and the main hook body is also provided with a tapered hole communicated with the second connecting hole in an axial direction, and a cross section of the tapered hole increases from the big end of the main hook body to the direction of the second connecting hole; and the big end of the main hook body is also provided with a notch so that the elastic belt can enter from the position of the notch and be clamped at the tapered hole, and a connecting beam is arranged in the second connecting hole, so that a safety rope penetrating through the elastic belt can be tied on the connecting beam; the elastic belt is hollow, and when the elastic belt is connected with the hook, the s

Abstract: The invention discloses an electronically controlled adjustable dumbbell comprising a handle grip, a weight stack, a base, an end cover, an electronic control system and a weight stack locking structure, wherein the weight stack is located below the handle grip. The invention solves the existing problems of adjustable dumbbells as follows: firstly, the operation is so complicated and cumbersome that it is quite difficult to adjust the weight in one try, and the novice who is new to the adjustable dumbbells cannot quickly adjust the weight plate; secondly, visually the product looks too complicated since the number that needs to be adjusted is printed on the cylindrical surface, and half of the numbers on the handle surface are located below the handle grip, which is difficult to see by the user; thirdly, the lack of modernity and inadequate aesthetics hinders product sales and makes it difficult to make profit quickly.