Super Strength is a supernatural ability possessed by vampires, werewolves, hybrids, and immortals. This allows them to be physically stronger than average adult humans, and to perform feats of strength far beyond what a person of their stature could achieve. Super strength varies among users, depending on their age, species, and diet.
Non-Original Vampires have super strength that gets stronger as time passes. The level of strength in vampires depends on their age and their diet - consuming human blood regularly makes them stronger than those that consume animal blood. Even transitioning vampires, have been shown to be several times stronger than they were before they turned. This was demonstrated in Blood Brothers, when Stefan, not knowing his own strength flung his father in a reflex retaliation when he attempted to stake him. They're stronger in comparison to werewolves when not in wolf form. In Season 3 episode, Ghost World, it was clearly shown that Damon had greater strength than Mason while shovelling into the Lockwood cellar. The tables are, however, turned when werewolves are in their wolf forms, during full moons, as was shown on at least three occasions during Season 2. Vampires often use this ability in conjunction with their Super Speed to make quick moves with great force.
Original Vampires are much stronger than even the oldest of non-original vampires, mainly as they were created for the sole purpose of fending themselves off of werewolves. They're stronger than werewolves that are even in their wolf forms. Non-original vampires are usually no match for Original vampires, except with the element of surprise. This ability has been used to break necks and spines, ripping out internal organs from even hybrids, and break and move heavy objects. Their impact can send people flying. Original vampires can also shatter windows and doors with even the smallest objects, such as anything from rooled-up newspapers and things as small as quarters, as Elijah threw a handfull of quarters as a window and the window exploded. Another case is when Klaus threw a newspaper at Elena's window in her old house. Elijah also has even displayed his strength as compared to a non-original vampire when he decapitated a 500+ years old vampire, Trevor with a single chop or swing of his bare hand.
The enhanced original is the different variant of Original Vampire that Alaric Saltzman was turned into, when he was remade by Esther. He was shown to be far superior to Rebekah in physical strength, implying that he is superior to most, if not all regular Originals. He also had enough physical strength to fight Klaus on equal ground, who is the Original Hybrid.
Immortals possess some form of super-strength, however it is vastly inferior to all other types of Vampire. Immortals are equal to members of the Brotherhood of the Five in terms of physical strength, and possibly equal to, or slightly below the level of Werewolves who are not in Wolf form.
Werewolves also have super strength which makes them much stronger than any Human, as seen when Mason easily defeats various people in an arm wrestle. It is also shown that untriggered Werewolves have some form of enhanced strength, as seen when Tyler defeats a number of people at arm wrestling and with relative ease. Their super strength is not on the same level as Vampires however, not even newborns. This is seen when Caroline easily overpowers Tyler when he tried to force the truth out of her. However, during full moons, they turn to their wolf forms. They get far stronger and more powerful than possibly all non-original vampires during full moons. A group of four transformed Werewolves was able to take down Rebekah, and two werewolves in human form using the moonlight stones to access to their wolf-form power, was able to take down Elijah will surprising speed and ferocity.
Hybrids have an extremely high degree of super strength. Newly formed hybrids are stronger than werewolves and even some vampires.They have a head start in strength due to their werewolf heritage. Although they are not as strong as a century old vampire and no where close to an original vampire, they can be considered stronger than those vampires that are not very old. It was seen in season 3 when Stefan and Damon could easily take down Klaus' newly formed Hybrids. Damon the upper hand against Tyler when they fought in Homecoming.
Klaus is the original hybrid, which makes him stronger than all other supernatural creatures, including all the Original Vampires. Just as an original is to a vampire, Klaus is to hybrids. This show of substantial strength has been demonstrated only by Klaus. He took on all of Marcel's vampire army, and won.
A group of supernatural hunters endowed with enhanced attributes to make them more effective hunters, super strength is one of these attributes and is used effectively against vampires and hybrids. Connor was able to rip a Hybrid's head off with proper leverage, and Jeremy was able to lift two drums in each hand whereas Matt could not lift one with both hands. Jeremy was also able to fight Silas on even grounds and could of possibly won if not for the latter's immortality.