This application is based on and claims the benefit of priority from Japanese Patent Application 2020-003214, filed on 10 Jan. 2020, the content of which is incorporated herein by reference.

BACKGROUND OF THE INVENTION

Field of the Invention

The present invention relates to an exercise tool used for physical exercises, muscle training, or the like in a state where the exercise tool is in contact with a use surface, such as a paved surface or a floor surface.

Related Art

A conventional exercise tool used for muscle training and/or health promotion includes a plate-like member that is placed on a floor surface so as to be slidable along the floor surface in one direction. During use, a user puts his/her feet on the plate-like member, and moves his/her body and limbs to slide the plate-like member.

For example, Patent Document 1 discloses a fitness tool including a long plate that is placed on a floor surface and a pair of foot placing plates provided to an upper surface of the long plate via rails in a horizontally slidable manner. A user can perform an exercise of opening and closing his/her legs by causing the foot placing plates to slide in a left-right direction with his/her feet. With this fitness tool, while lying face down with his/her hands placed on one of the foot placing plates and his/her knees placed on the other of the foot placing plates, the user can flex and extend his/her lower back by causing the foot placing plates to slide in a front-back direction, so as to perform an abdominal muscle training.

Patent Document 1: Japanese Unexamined Utility Model (Registration) Application Publication No. 3162539

SUMMARY OF THE INVENTION

With the fitness tool described in Patent Document 1, the motion of the hands and feet is limited to the ones taken place along the sliding direction of the foot placing plates. Therefore, parts of the body subjected to the load are limited. The limited variation in exercises and muscle training may sometimes dissatisfy the user. In addition, in a state where the foot placing plates are stopped, it is difficult to use the fitness tool for dynamic muscle training involving a motion of the wrist(s) and/or ankle(s), although the fitness tool can be used for static muscle training, such as holding the posture with which a load is applied to a specific part of the body. Therefore, there has been a demand for an exercise tool that enables wide variations in exercises and muscle training even in a state where the exercise tool is stopped.

In view of this, an object of the present invention is to provide an exercise tool that enables wide variations in exercises and muscle training even in a state where the exercise tool is stopped on a use surface such as a paved surface or a floor surface.

(1) An exercise tool according to the present invention includes: a base having a contact part that is in contact with a use surface; a movable part magnetically and detachably held above the base; a three-dimensionally movable support unit configured to support the movable part that is held by the base, in such a manner as to allow the movable part to move three-dimensionally and flexibly; and an attachment part via which the movable part is detachably attachable to a hand or a foot in a direct or indirect manner. The use surface herein is not limited to the ground outdoors. In the outdoors, the use surface may be a paved surface or the like, for example. In the indoors, the use surface may be a floor surface or the like, for example. The contact part herein can be formed in the shape of a point, a line, or a plane in a three-dimensional view. For example, in a case where the use surface is a geometric plane and a complete solid body and the contact part are a complete sphere, the contact part is formed in the shape of a point.

(2) In the configuration of (1), the three-dimensionally movable support unit may include a spherical-surface shaft provided to one of the base and the movable part and a recessed-surface bearing provided to another one of the base and the movable part and designed to be slidably fitted to the spherical-surface shaft.

(3) In the configuration of (1) or (2), the base may include a sliding unit configured to enable the contact part to glide over the use surface.

(4) In the configuration of (3), the sliding unit may include a ball bearing configured to work as a contact point with respect to the use surface.

(5) In the configuration of (3) or (4), the base may include the sliding unit and a base body, and the sliding unit may be detachably attached to the base body.

(6) The configuration of any one of (1) to (5) may include an elastic member coupling the base and the movable part to each other, the elastic member being configured to buffer movement of the movable part and to restore a relative position of the movable part with respect to the base to a reference position.

(7) In the configuration of (6), the elastic member may be magnetically and detachably held by both the base and the movable part in a slidable manner around a predetermined center axis line defined in the base.

According to the present invention, it is possible to provide an exercise tool that enables wide variations in exercises and muscle training even while the exercise tool is stopped on the use surface such as a paved surface or a floor surface.

