Hi Amber!
Thank you for bringing your question to the Disney Parks Moms Panel!
No worries! During
Princess Half Marathon Weekend, there will be complimentary runDisney bus transportation to and from each Walt Disney World Resort, including Disney's Pop Century Resort.
After you check into your room, you will want to follow the signs in the resort lobby to the runDisney bus location. Buses will run continuously throughout the day to the expo. The Health and Fitness expo hours are as follows for Princess Half weekend:
runDisney Health and Fitness Expo ESPN Wide World of Sports Complex Thursday, February 23, 2017 — 10:00 a.m. – 8:00 p.m.
Friday, February 24, 2017 — 9:00 a.m. – 7:00 p.m.
Saturday, February 25, 2017 — 9:00 a.m. – 3:00 p.m.
I hope this helps! Please let me know if you have any other questions.