Gymnasium is one of the in good state building in Termessos.
It is situated inside the walls in the upper part and to the east of the king’s road. It is made of rooms arranged around the columned halls and a large central courtyard.
The central courtyard has the sizes of 50x8m while the building is 91x15m. The front wall was decorated with arches and the niches and it was made of big blocks of stone and also it is in a good state today.
Wall niches housed the statues which belong to the important people. There were baths on the east of the gymnasium for washing of the athletes.