Exercising Demons - Franklin is a Strangers and Freaks mission for, well, Franklin.

We meet Mary Ann yet again, this time at a beach. Franklin tries talking to her, but she thinks he's making fun of her. She challenges him to a 3-way (triathalon).

Start by running into the water and swimming across the river. On the other side there are two bikes, get on one once you have swam across. On the bike portion of the race there is a bridge that has a jump on it, make sure to bunny-hop over it and land (this is also a stunt jump location). After you finish the bike portion you will have a foot-race to the finish. Just beat Mary Ann and the mission is complete.