Although it may not immediately look like this course is really worth it, you should be happy to know that you'll receive a 700xp bonus at the end, for a total of 1,112 experience!
If you fail an obstacle, you'll fall to the lower level (so if you were on the third level, you'll fall to the second).
At the top of the pyramid you'll find a gold pyramid. Take this, and bring it to Simon Templeton who can be found just outside of the pyramid. He will buy it from you for 1,000gp--not a bad deal!
For specific information on this Agility course, please visit the Agility Pyramid Guide.
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Penguin Agility Course
After completing the Cold War Quest, you'll have access to the Penguin Agility Course which requires 30 Agility and a Penguin Suit disguise.
The Penguin Agility Course is located on the Iceberg north of the Penguin Outpost. To get here, head to Rellekka, either by walking, or by using your Enchanted Lyre teleport. Take the boat from Rellekka to the Iceberg, and then head to the avalanche to the northwest. To the west is a room; follow the corridor to the Penguin Agility Course.
Penguin Agility Course
Obstacle Agility Experience
Climb Platform 55
Platform Jumps 80
4 Icicle Gates 40
Ice Slope 180
Agility Bonus 65
Total 540
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Barbarian Outpost Course
After reaching level 35 Agility, you'll have the ability to enter the Barbarian Outpost training area located northeast of the Tree Gnome Stronghold. But before entering, you'll need to complete the Alfred Grimhand Barcrawl. Once you complete it, you can enter the area, climb through the Pipe and begin to train your Agility!
For fully completing the course, you'll receive 117xp, along with a 46.2xp bonus, for a total of 163.2 Agility experience. Be warned however, that the obstacles can be failed and you'll take damage, so it's a good idea to bring some food with you. Should you fail an obstacle, make sure to try it again so that you can receive the full amount of experience.
First, swing on the Rope Swing and then cross the log. Climb up the Net, cross the Ledge and climb over the 3 Low Walls.
Barbarian Outpost
Obstacle Agility Experience
Pipe 10
Rope Swing 22
Log 13.7
Net 8.2
Balancing Ledge 22
3 Low Walls 41.1
Bonus 46.2
Total 163.2