NOVELTY - The device (1) has a pair of opposed longitudinal handles (2, 3) which are separated at proximal ends by a spacing member (4), where the spacing member comprises a central portion (5) displaced from the handles and includes a force indicator (6) e.g. spring, for indicating force applied by the device. A hemispherical member is fitted to an outer surface of the central portion. The handles have two hand-grips (10, 11) for providing grip. The indicator has an electronic device e.g. personal digital assistant (PDA), that emits an auditory or visual signal when a desired force is applied.    USE - Exercise device for activating antigravity posture muscles to support and protect spine from injury during performing simulated weight bearing exercise for spine, shoulder girdle, arms, and upper limb joints.    ADVANTAGE - The device activates the antigravity posture muscles to support and protect spine from injury during performing simulated weight bearing exercise, so that the upper trunk postural alignment and spinal stability are maintained during lower limb exercise and during simulated weight bearing exercise, thus strengthening and increasing the stability of the spine, and hence enhancing the stability of the spine, shoulder girdle, arms, and the upper limb joints, and promoting muscle and bone health of the spine, shoulder girdle, arms, and the upper limb joints in an effective manner.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following:    (1) a method for strengthening and increasing the stability of a spine by providing a self resisted axial head load    (2) a method for maintaining upper trunk postural alignment and spinal stability during lower limb exercise    (3) a method for graduated unstable weight-bearing exercise for a spine, shoulder girdle and arms.    DESCRIPTION OF DRAWING(S) - The drawing shows an elevational view of an exercise device.    Exercise device (1)    Longitudinal handles (2, 3)    Spacing member (4)    Central portion (5)    Force indicator (6)    Hand-grips (10, 11)