NOVELTY - The exercise machine has two carriage supports respectively and slidably coupled to the upstanding posts (110) of a weightlifting frame (100) to selectively attach to the upstanding posts and support the riding carriages (154) of the free weight holders (150). The downward travel of the riding carriages is limited to make the riding carriages with the free weights (152) rest on the carriage supports.    USE - For enabling exercise with free weights.    ADVANTAGE - Enables weightlifter to lift weights until weary and to release weights without dropping them. Provides greater safety for weightlifters engaging in free weightlifting activities by providing self-spotting mechanism for free weights. Provides a free weight holding mechanism for use in association with weightlifting frame. Provides a manually-engageable weightlifting units adapted for use with a self-spotting mechanism. Provides a free range of motion for weights used in a self-spotting system. Provides a latching system for stably positioning free weights.    DETAILED DESCRIPTION - The upstanding posts are coupled together by a floor support (102) which supports the weightlifting frame on a floor. Two rails (122) are coupled to the floor support and upstanding posts, such that the rails are set parallel and adjacent the upstanding posts, respectively. The free weight holders are slidably coupled to the rails while the riding carriages are couple the free weights to the weightlifting frame. INDEPENDENT CLAIMS are included for the following:    (a) the latching system for free weights;    (b) the free weight holder;    (c) the self-spotting mechanism; and    (d) the weight bar holder.    DESCRIPTION OF DRAWING(S) - The figure shows the right top perspective view of a weightlifting frame incorporating free weight holders and supports.    Weightlifting frame (100)    Floor support (102)    Upstanding posts (110)    Rails (122)    Free weight holders (150)    Free weights (152)    Riding carriages (154)