A tilting inversion exerciser includes a table rotatably supported on a supporting stand, a foot retaining device for being powered and actuated to clamp and to retain ankle portions of the user to the table without being operated manually by the user. A motorized coupling device may move and adjust the table relative to the stand. A safety device may be used for switching off the foot retaining device to prevent the ankle portions of the user from being disengaged from the foot retaining device inadvertently when the table is operated by the user, particularly when the table and the user are rotated to a vertical position relative to the supporting stand and the ground.

A spine stretch machine, comprising: an inverting part and a back stretch part. The inverting part has a platform allowing a person to lie on it, a inversion motor to move the platform from horizontal to vertical, a feet anchor which is extendable driven by a leg adjustment motor, thus making the body upside down to stretch the spine. A safety release device in the inverting part can move the platform back to horizontal when the inversion motor is broken. The back stretch part has a back press unit which protrudes from the platform to press the back of the body and a second motor-driven unit which can drive the back press unit to roll back and forth alone the spine to massage the back, thus making the spine flexible.