Free-to-play Constitution training

Introduction
Firstly, here is an introduction of hitpoint in F2P world. Hitpoint, of course, is the measurement of endurance and capacity of a player before having to retreat or even fall down during combat or adverse conditions, like being chased by revenants. Hitpoint experience is gained in all combat involving actual damage to the target. Strictly speaking, for every damage dealt by either melee, ranged or magic, 1.333 or 4/3 experience is gained. Then only variation for fighting power not involving hitpoint at all is curse spells and prayer. Hitpoint, unlike most of the skills, are neglected and trained against to ensuring a low combat level with high combat abilities. These players do not really aim for decreasing the hitpoint level but other combat stats, thus low hitpoint level is only a result of it. However, even non-pures would have slight difference about their hitpoint level regarding their style of combats, which is mainly caused by use of magic spells and unbalance of combat skills.

There is no quest that increase hitpoint experience in F2P world.

Magic pures
Magic pures are the kind of pures with lowest hitpoint available, mainly due to the fact a base magic experience is gained regardless of success or failure of the spell.

Curse spells
To train magic without training hitpoint, the best way is to repeatedly cast curse spells, which can give magic experience only. The spells Confuse, Weaken, Curse can be cast at minimum level 3, 11, 19 respectively, giving experience of 13, 20.5, 29 XP respectively. The best place to train curse spells is at Lumbridge combat hall, in which the magic dummies are capable to be multi-casted.

Failed combat spells
Another way to train magic without training hitpoint is casting splashed combat spells. Strike spells, as the weakest kind of the missile, hit very low and have low cost. Earth strike or fire strike can be used for this purpose, and wearing full metal armor is essential for splashing, except attacking the magic dummies, which gives only 0.1 hitpoint XP per damage dealt.

Quests
This quest gives experience capable to raise magic level from 1 to 4, making cursed spells training available without having to use missile spells to train first.
 * Witch's Potion

Earth strike costs coins each attack if Staff of earth is used, yielding 6.5 experience and maximum of 6 damage, fire strike costs coins each attack if Staff of fire is used, yielding 35 experience and maximum of 8 damage.

Melee pures
Melee pures are somewhat lower in hitpoint than non-pures, but not very low as closed combat yields abundant hitpoint XP.

Quests
4825 attack experience is given upon completion of quest, which is vital for decreasing hitpoint level for getting 40 attack faster. This quest is only available for rune strength pures. The defense level must be lower than 33 in order to attain minimum defense level of 40 after the quest. This quest yields 18650 strength and defense experience upon completion of quest.
 * Vampire Slayer
 * Dragon Slayer

Mechanics
No matter the way a melee pure trains, one third (1/3) of experience is also added to hitpoint experience. It is advised the skills to be unbalanced in order to attain lowest hitpoint level.

Ranged pures
Ranged pures in F2P world has higher hitpoints, only being suppressed by rune strength pures and 1 defense pures. Ranged pures should focus on Accurate or Rapid attack style, because excessive defense experience will slow down leveling ranged. There is no quest relating to ranged experience in F2P world.

Non-pures with lower hitpoint
The topic sentence Non-pures with lower hitpoint is defined based on combat level, not on the actual ability to train in long term. What the topic sentence means is that how to make hitpoint level low while combat abilities is good, as a non-pure. A player with low hitpoint can have advantage of making opponents underestimated even as a non-pure. However, the method of making the hitpoint low while being a non-pure is a strange deal, because usually only 3-7 hitpoint level can be reduced using these methods in long run.

Quests
4825 attack experience is given upon completion of quest, which is vital for decreasing hitpoint level for getting 40 attack faster. This quest yields 18650 strength and defense experience upon completion. This quest gives experience capable to raise magic level from 1 to 4, useful for lowering hitpoint level for new players.
 * Vampire slayer
 * Dragon slayer
 * Witch's Potion

Usage of spells
To attain lower hitpoint, non-pures can cast strike spells or curse spells on magic dummies, alike magic pures.

Alignment of combat skills
Attack, strength, ranged or magic, only one of them should be excelled to make the character powerful at certain combat level. Defense is not considered as this makes character unable to deal fatal blows. Prayer should be trained to level 43 or left at level 1 because this skill requires no hitpoint experience, but affecting the combat level very much.

Non-pures with higher hitpoint
The topic sentence Non-pures with higher hitpoint is defined based on combat level, not on the actual ability to train in long term.What the topic sentence means is that how to make hitpoint level high while combat level is low, as a non-pure. This is a common combination because hitpoint experience in long term cannot exceed 1.5 times of any combat skill, assumed all skills are trained at equal rate and magic attacks yield half hitpoint experience compared to other skills.

Quests
To tackle quests with combat experience as award, the skills which the quest reward offers should be temporarily abandoned.

Alignment of combat skills
Equal experience of attack, defense, strength, ranged and magic should be attained, with prayer at either 1-37-40-43 level to keep the combat level minimum but hitpoint experience maximum, along with minimum or sufficient prayer abilities in order to minimize the effect by prayer to combat level.

Usage of spells
To attain higher hitpoint, non-pures can cast strike spells to NPCs with very large hitpoint supply, like lesser demons.