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The Beat the **** marathon is actually a triathlon that consists of a swim, bicycle ride and then a marathon run. In total it is approximately 6.75 kilometers based on the ingame stat measurement. The marathon is located at Santa Maria Beach, Los Santos (see below screenshot). It is only available on weekends , and you must also have to complete the Green Sabre story mission for this event to unlock. You can check the current day of the week by holding right on the dpad at any point during the game.
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The triathlon is best attempted at the end of the game as you will need quite high stats, especially stamina, lung capacity and cycling skill. You will also need to have at least 50% stamina and 50% cycling skill before starting this event. You can increase your stamina quickly by riding the bike at the gym, but the cycling skill will take longer to increase. Just keep riding a bicycle around until the stat increases.

Once you are ready, simply make your way to the red marker on the weekend to start the triathlon. You will first need to swim across Los Santos Inlet. You will probably fall quite far behind at this point as the other competitors are very fast swimmers and seem to have unlimited stamina. Once you make it to the other side you will begin the cycle leg of the event, which will see you travel through Avispa Country Club. Eventually you will start the last section of the event which is the run. By this point you should have quite a comfortable lead from the cycle section. Once you cross the finish line and win the triathlon, the trophy will unlock.