Abstract: A lower back exercise and apparatus for performing a lower back exercise. The apparatus has a vertical pendulum suspended under the person exercising, who lies prone above the pendulum. The person's legs are retained in a resistance transfer apparatus that pivotably connects to the pendulum. Weights may be added to the pendulum The exercise raises the person's legs from the vertical to the horizontal. The exercise then lowers the legs from the horizontal through and past the vertical rest position, in a total motion substantially greater than 90 degrees, using the same muscle groups to push the legs past the vertical rest position. The body support platform may be adjusted to various angles with respect to the horizontal.

Abstract: A lower back exercise and apparatus for performing a lower back exercise. The apparatus has a vertical pendulum suspended under the person exercising, who lies prone above the pendulum. The person's legs are retained in a resistance transfer apparatus that pivotably connects to the pendulum. Weights may be added to the pendulum The exercise raises the person's legs from the vertical to the horizontal. The exercise then lowers the legs from the horizontal through and past the vertical rest position, in a total motion substantially greater than 90 degrees, using the same muscle groups to push the legs past the vertical rest position. The body support platform may be adjusted to various angles with respect to the horizontal.

Abstract: An adjustable lever arm--variable resistance cam assembly employing a cam for producing therefrom a variable resistance force when a constant resistance force is applied thereto and in which the lever arm may be initially positioned at a range of angular positions without thereby affecting the variable resistance force produced by the cam at each particular angular position of the lever arm upon rotation thereof. The adjustable lever arm--variable resistance cam assembly may be employed in a weight lifting machine or device of the type having a rotating lever arm for application of weight lifting force by the user. The assembly allows the user to angularly adjust the initial position of the lever arm in relation to the axis of the cam and, nevertheless, maintain the cam in appropriate relation with the constant resistance force. The variable resistance force produced by the cam will then not vary with respect to positioning of the lever arm as rotated during exercise.