Either the Fire Giants at Baxtorian Falls or the level 25 ( 100hp ) experiments near Canfis, quest needed.
Killing Fire Giants at Baxtorian Falls is a great place for training.
The usual method is to fight. If you have a membership, I suggest you combine combat training with Slayer tasks.
It really depends on what combat lvl you are but its prbably hill giants or moss giants
A multi-combat zone full of either demons or dragons.
Anywhere that's multi-combat with Demons or Dragons, you could try Taverly dungeon.
A good way to train combat in Runescape is to go to Soul wars. whats the best thing if im nonmembers
The best in order are:RangedMeleeMagic
Warriors I would think.
I always trained at the Yaks (lvl 22) at the Fremennik Isles. Though they're a relatively low-level NPC, they have huge HP points. You'll burn through experience points in no time.
I would have to say combat level 89 or 77
Fight a lot.
From my experience the rock crabs found in rellekka and drags if your a higher lvl Rune wiki has a good combat guide too