To train specifically for 800 m races, the energy used in training sets should be 87% aerobic and 13% anaerobic. This study compared several sets of repetitions: 24x 50 m; 12 x 100 m; and 6 x 200 m. Work:recovery ratios of 1:2, 1:1, and 1:.5 were also employed. Repetition speed was kept constant and equal to the average pace of a maximum 800 m swim. Implication: For 800 m race-specific training, the following sets and their work:recovery ratios are appropriate: 6 x 200 m at 1:2; 12 x 100 m at 1:.5; and 24 x 50 m at 1:.5. These sets should be performed at intended 800 m race pace and should form the bulk of specific 800 m race training in the latter stage of the specific preparatory and during the pre-competition training phases.