Stadiums In the Ancient World
In the Greco-Roman world stadiums were used for athletic contests including running races (compare Acts 20:24; Gal 2:2; Phil 2:16; 2 Tim 4:7; etc.) wrestling, boxing (1 Cor 9:26–27), discus and javelin throwing and other spectacles.
Note how the writer of the book of Hebrews (12:1) writes "Therefore, since we are surrounded by such a great cloud of witnesses, let us throw off everything that hinders and the sin that so easily entangles, and let us run with perseverance the race marked out for us."