Jaspreet Singh Kalra is extremely flexible. He is known as THE RUBBER BOY. No one else can compete his flexibility. Once you watch the video you will also like to call him by the same name. Jaspreet has a unique talent of being able to flex in unnatural positions. The super human characteristic is a god given gift which is extremely rare. The fact his head can turn almost 180 degrees is quite remarkable as it’s almost impossible for a normal human to pass 90 degrees.
The ability to be so flexible has many reasons:
According to Gummerson, flexibility (he uses the term mobility) is affected by the following factors:
the type of joint (some joints simply aren’t meant to be flexible)
the internal resistance within a joint
bony structures which limit movement
the elasticity of muscle tissue (muscle tissue that is scarred due to a previous injury is not very elastic)
the elasticity of tendons and ligaments (ligaments do not stretch much and tendons should not stretch at all)
the elasticity of skin (skin actually has some degree of elasticity, but not much)
the ability of a muscle to relax and contract to achieve the greatest range of movement
the temperature of the joint and associated tissues (joints and muscles offer better flexibility at body temperatures that are 1 to 2 degrees higher than normal)
The resistance to lengthening that is offered by a muscle is dependent upon its connective tissues: When the muscle elongates, the surrounding connective tissues become more taut (see section Connective Tissue). Also, inactivity of certain muscles or joints can cause chemical changes in connective tissue which restrict flexibility. According to M. Alter, each type of tissue plays a certain role in joint stiffness: “The joint capsule (i.e., the saclike structure that encloses the ends of bones) and ligaments are the most important factors, accounting for 47 percent of the stiffness, followed by the muscle’s fascia (41 percent), the tendons (10 percent), and skin (2 percent)”.
M. Alter goes on to say that efforts to increase flexibility should be directed at the muscle’s fascia however. This is because it has the most elastic tissue, and because ligaments and tendons (since they have less elastic tissue) are not intended to stretched very much at all. Overstretching them may weaken the joint’s integrity and cause destabilization (which increases the risk of injury).
When connective tissue is overused, the tissue becomes fatigued and may tear, which also limits flexibility. When connective tissue is unused or under used, it provides significant resistance and limits flexibility. The elastin begins to fray and loses some of its elasticity, and the collagen increases in stiffness and in density. Aging has some of the same effects on connective tissue that lack of use has. Source MIT