Abstract: A casing has a hollow body, at least one wheel holder and at least one wheel. The body has at least one cavity to respectively receive the at least one wheel holder. Each wheel is rotatably mounted on one of the at least one wheel holder. With the arrangement of the at least one wheel, the casing can be transported conveniently and easily.

Abstract: A passive shock absorber for a treadmill includes a tall damping member and a short stopping member for supporting the tall damping member. Both the tall damping and the short stopping members have a top, a bottom and a spring stiffness, respectively. The tall damping and the short stopping member are combined together and are mounted in the treadmill. The passive shock absorbers are adapted to mount under a flat stationary member on which a person walks, runs or jogs. The top of the tall damping member abuts the flat stationary member. Consequently, the tall damping member can absorb impacts on the person's feet and the short stopping member will stop a compression of the tall damping member as the tall damping member is suddenly deformed and compressed.

Abstract: A treadmill has a stand, a running assembly, a handle assembly and an insulation connecting assembly. The insulation connecting assembly is mounted on the stand to keep the handle assembly from electrically connecting with the running assembly. In such an arrangement, a static electricity free handle assembly is mounted on the treadmill to keep the static electricity from being discharged when the user contacts with the handle assembly.

Abstract: An inclination mechanism for a treadmill having a tread assembly and a front base assembly has a lever arm, a chassis, an actuating assembly, The lever arm has a cross member with a center and two coupling arms pivotally attached to the front of the tread frame. Each coupling arm is pivotally attached to a post of the base frame. The chassis is pivotally attached to a cross bar of the base frame. The actuating assembly has a drive rod and is mounted on the chassis. The drive rod is pivotally attached to the cross member of the lever arm, such that extending or retracting the drive rod causes the lever arm to raise or lower the coupling ends of the coupling arms to increase or decrease the inclination of the tread assembly.