PHILADELPHIA (WPVI) -- The 130th Penn Relays are underway in Philadelphia's University City neighborhood.
Races kicked off at 9 a.m. on Thursday at Franklin Field.
Up to 20,000 high school, college and professional athletes from across the globe are expected to compete, showing off their speed and endurance.
Thousands of spectators will also pack the stands for the three days of competition
The Penn Relays date back to 1895 and are the oldest track and field competition in the country.