Constitution

 Constitution also known as health and formerly as Hitpoints or HP is a skill that affects how many life points (LP) a player or monster has. Life points represent the amount of damage a player or monster can withstand before it dies. Death occurs when a player or monster's life points reach zero. Skills such as Constitution, Attack, Strength, Defence, Ranged, Magic are combat skills.

You may train then via Slayer or fighting various monsters.

Step 1.

Walk towards Barbarian Village (next to Varrock).

Step 2.

Once you've arrived in barbarian village simply click on the "Entrance" (It's surrounded by ore) to enter the stronghold.

'''Step 3. '''

Then proceed to advance through the different levels of the stronghold until you're at your desired combat level.

You're Welcome! Be Sure to check out the tips at the bottom!

Tips & Tricks 
 * It's recomended to ALWAYS take food when fighting any NPC's.
 * Make sure you're using the best possible weapons & armour for your level for optimal experience gain.
 * If you plan on fighting monsters for extended periods of time be sure to take more armour/wepons for your level in each respective combat skill.
 * I reccomend you un-note your food in the bank and also buy the combat gear you plan on using.