You can level up fast by training a specific skill and focus on training that skill. Some people like to do mini games for the experience.
by killing monsters
You can select an attack type that gives you only defense experience. Note that this will give you no attack or strength experience.
fist of guthix
if you're p2p with high levels, I suggest Armored Zombies. If you're a f2p player, I recommend ankous or minotaurs in the security stronghold(barbarian stronghold).
cut willows. they give a good amount of exp but they do not make a lot of money. If you have other questions, add hy839 on your friends list and ask. I'm a lvl 126......
train everything up to lvl 100
you keep training your skill to get up to lvl 99
I suggest getting your woodcutting lvl to 60 and cut yews, or get your mining lvl to 40 and mine gold.
Do woodcutting once lvl 60 you can get millions in a week if you play a lot
lvl 79
There is no command to level up on RuneScape. You have to train your stats through sheer hard work. There is no easy way around levelling up.
you get agility exp and when you lvl up, you can run longer