However, it won't give you much better buy OSRS gold exp rate than the Rellekka course, these levels of training Agility are really boring so every different kind of training comes in useful. A great course to take when you're bored with both Rellekka and Brimhaven and you aren't past 90 yet.
If you're over fifty in the fishing skill and over 15 in Agility, there's another way to get your training that includes Barbarian Fishing. Fish that leap like Trouts, Salmons and Sturgeons will reward those with previous experience in both Fishing and Agility which can be a great alternative to the regular methods. If you are aiming to improve your level with this game to 99 Fishing, then you'll achieve 74 Agility during the process. Remember that 15 Agility unlocks only Leaping Trouts. For Salmons you'll need 30, and 45 to unlock Sturgeons.
To start Barbarian Fishing head to Otto's Grotto which has 15 Agility 15 Strength and Fishing levels of 58. Talk to Otto and after a quick conversation search under his bed where you will find a heavy Fishing Rod. Make sure to have enough feathers or bait in your possession and then you can begin fishing. When you catch Leaping Trouts, Salmons and Sturgeons you'll gain a portion of experience on Agility and Strength addition to the regular fishing experience.
It is suggested to start this type of old school rs gold training as soon as you can, as it's perfect for people with lower levels of Agility and not as good when you are at 99. Also, if fishing is a second favorite skill after Agility you'll be wasting many hours of Agility for nothing. Since Agility training is usually boring, Barbarian Fishing is a great idea to look into.