Hamon

Hamon (also referred to as Ripple or Sendo) is a technique used in the early parts of Jojo's Bizarre Adventure. Through the use of controlled breathing, the user can fill their body and attacks with sunlight energy, making it very effective against Vampires, Zombies, and Pillar Men.

Various Uses.
Hamon can be flowed through object the user touches, allowing a great deal of variety in what they can do with it. It isn't simply "sunlight punches", as the ripple can have various effects depending on what it's used for.
 * Jonathan Joestar used a technique called "Zoom Punch", which extended out his joints to the point of breaking, but healed them at the same time with Hamon, allowing him to punch opponents who were far away.
 * Will Zeppeli flowed his Hamon into small puddles of wine, firing them from his mouth with enough strength to cut knives in half
 * Lisa Lisa flowed Hamon through her scarf, completely wrapping her opponents in Hamon energy.
 * Caesar Zeppeli flowed Hamon through bubbles of soap.
 * Joseph Joestar flowed Hamon into his weapons, such as his Tommy Gun, ropes, and Clackers.

Weaknesses.
Hamon has a great deal of variety, but it has one gaping weakness. It's dependent entirely on how well the user can control their breathing. As they fight and sustain injuries, a Hamon user will begin to grow weaker and lose control of their power, allowing opponents to gain an upper hand over them.