Hey there! Here I’ll show you this agility course from the new Land out of Time island, Anachronia. Every run gives a base XP of 36.540 and you can do 6 runs per hours. That would mean you would be getting over 220k agility XP per hour and about 70 codex pages! This is currently one of the best agility training method and you can also make some money here, what are you waiting for to do this for yourself!
Check for some more info here:
Game: RuneScape 3 (JAGEX)
The music is just the game music.