contrary to what most people here are saying, brimhaven is far and away the best place to train agility. Provided you try to get back to the middle platform each time and conserve energy where u can, you should rarely miss a ticket. Up until you are about level 50 agility you may miss a few due to failing obstacles, however no more than 4 or 5 per 100. Once you are in the low 50s for agility level, you should not miss more than 1 or 2 per 100 at most. Of course if you prefer mindless repetitive boredom, use one of the round and round and round agility courses. Brimhaven agility arena is one of the few mentally challenging areas of runescape, requiring quick strategic thinking. I suppose this is probably why the majority of players dont like it.