Abstract: The invention relates to an adjustable dumbbell and its use method. The dumbbell comprises a base and a dumbbell body, the dumbbell body comprises a handle and a bell piece, the handle is a combination of a central shaft and a handle sleeve, the handle is also connected with an indexing plate, a gear piece and a bell piece box, the ends on both sides of the central shaft are provided with a snap ring groove and a gear step from the outside to the inside, and the indexing plate is provided with a lock The bell box is connected with a bell box cover, the bell box cover is connected with a locking leaf spring and a steel ball spring, the locking leaf spring is connected with a locking leaf, and the steel ball spring is connected with a steel ball.

Abstract: The invention discloses a multifunctional trampoline, which relates to the field of children's entertainment. The utility model relates to a multifunctional trampoline, which comprises a football frame. The left wall surface of the football frame is fixedly provided with a bottom support frame, the outer thread of the bottom support frame is provided with a top vertical strut, the upper end surface of the bottom support frame is welded with a circular frame, and the circular frame is formed by inserting a multi end arc frame and fixedly connecting with bolts, and the top surface of the circular frame is provided with a trample cloth, The top vertical strut is provided with a top connecting device, and the inner side of the top connecting device is fixedly connected with a purse seine, the inner side of the top vertical strut is provided with an arc contact block.

Abstract: The present invention relates to a trampoline with adjustable elasticity. The trampoline includes several corresponding trampoline ring parts, and adjacent trampoline ring parts are connected through a joint to form the trampoline; and an arc length between the adjacent trampoline ring parts changes through adjustment of the joint, and is fixed after relative positions of the two adjacent trampoline ring parts are properly adjusted. The elasticity of the trampoline of the present invention is adjustable, thereby providing a user with an exercise experience of a variety of elasticity.

Abstract: The present invention relates to a trampoline with adjustable elasticity. The trampoline includes several corresponding trampoline ring parts, and adjacent trampoline ring parts are connected through a joint to form the trampoline; and an arc length between the adjacent trampoline ring parts changes through adjustment of the joint, and is fixed after relative positions of the two adjacent trampoline ring parts are properly adjusted. The elasticity of the trampoline of the present invention is adjustable, thereby providing a user with an exercise experience of a variety of elasticity.