There are many places in Runescape to train, from the Cows in Lumbridge to the Minotaurs in the Stronghold of Security. You can train anywhere there are monsters to kill. So, where to train is not the question. The question is, what to train on. The answer depends on you. There are many variables in what to train on.
They are fast to kill, give a fair amount of experience points, and hit very low when they attack (train attack runescape for all other guides). This makes Goblins the prime monster to fight when you are trying to level up. Goblins can be found all over Runescape. Now if you are looking for items, the Greater Demons have excellent drops. They can be found at the back of the wilderness. As I said, training in Runescape is about what you want to train on, that alone decides where to train.
I used a mixture of Goblins and Minotaur when I was leveling my attack to level 60. They were close by in the Stronghold of Security, so when I felt I was not leveling as fast on the Goblins, I went to Minotaur.
The biggest is, what are you looking to gain? If its levels, you want something that is an easy kill so you get more experience points for your time. However, if you are after items, simply kill the thing that gives the best drops. (For this, usually you will need a lot of food, because they will hit you very hard.) One of the best monsters in my opinion for getting levels is the Goblin.

Tags: Best Places to Train in Runescape