Both arenas are quite hard (solo), especially the second one. I had to leave The Great Temple in order to find more treasures/complete side quests that would increase my health, stamina, and intenso bars.
Therefore, make sure that you:
1. Come well-trained to the arenas. I recommend the health bar being at least the size of six stamina cubes.
2. Do not forget to complete both arenas as Javier Jaguar (if solo).
Good luck!