Patent ID: 7503881

Claim:
An exercise machine comprising: a base frame having a pair of upright members; a barbell supportable on said upright members; at least one weight stack; means for operably connecting said at least one weight stack to said barbell; said at least one weight stack formed of an uppermost weight member superimposed on a plurality of underlying weight members directly below said uppermost weight member, said uppermost weight member connected to a first underlying weight member by a first set of at least one telescopic pins and said first underlying weight member is connected to a second underlying weight member directly below said first underlying weight member by a second set of at least one telescopic pins such that lifting the barbell can initially result in only the uppermost weight member exerting resistance against said barbell until said uppermost weight member is lifted a predetermined distance above the first underlying weight member at which time the first underlying weight member will also apply resistance to said barbell and further lifting of said barbell a further predetermined distance will engage the second underlying weight member to also apply resistance to said barbell to provide a workout having an incrementally increased resistance during a given exercise repetition.