Your regeneration rate is how quickly your chakra/stamina/HP recharges.

There are six ways to increase your regeneration:

• Join a village with a high regeneration rate.
• Buy a house with a high regeneration rate.
• Buy temporary regeneration boosts through the Black Market.
• Earn PvP experience to temporarily increase your regeneration.
• Rank up to permanently increase your regeneration.
• Roll a bloodline with a regeneration increase.

• Having an occupation (see spoiler)
• Doing surgery will reduce your regen by 20% for the duration of the recovery period.
• Training special jutsu will reduce your regen by one for the three hours it takes to train.
• Joining a village (temporary: see spoiler below)
• Going into battle will reduce your regen by ~67% for the duration of that battle.

The formula for regeneration is as follows:

Regen = base regen + (village regen * rank weight)

• Village Regen Thread
• ceedee's Guide to Homes/Camps