updated 05/09/2010 AT 7:00 PM ET
•originally published 05/11/2010 AT 7:30 AM ET
Since her brave battle with breast cancer, Christina Applegate has learned to focus on feeling good.
“Stress isn’t something I really allow into my life. It creeps in but that’s a huge thing, changing my diet, changing my want to make everyday the best that I can,” Applegate, 38, told PEOPLE over the weekend at the Entertainment Industry Foundation’s annual Revlon Run/Walk in Los Angeles.
The actress and her support system – which includes her mother and fellow breast-cancer survivor, Nancy Priddy, friends and 20 crew members from Samantha Who? – were part of the group of 40,000 people who turned out at the event to help raise money for women’s cancer research.