A local mom and Pilates instructor will be fighting for the top prize on “Survivor: Cagayan,’’ a reality TV show on CBS, the network recently announced. Trish Hegarty, 48, a trainer at Dish Studios on Chestnut Street, and a single mother with two daughters, graduated from Westfield State in 1988 with a bachelor’s degree in elementary education, and was a captain of the women’s soccer team, according to the college. The 28th edition of the popular show is set in the Philippines, and will take on a theme of “Brawn vs. Brains vs. Beauty.” Hegarty will be assigned to the “Brawn” tribe, which she touted on her cast biography website page as the most likely to outlast the other two groups. The show premieres Feb. 26 at 8 p.m. on CBS, according to the network. For more information, visit www.cbs.com/shows/survivor.