A derecho (/dÉËreÉªtÊoÊ/, from Spanish: derecho [deËÉ¾etÊo], straight) is a widespread, long-lived, straight-line wind storm that is associated with a land-based, fast-moving group of severe thunderstorms. Derechos can cause hurricane-force winds, tornadoes, heavy rains, and flash floods.
In human anatomy, a hamstring is one of the three posterior thigh muscles in between the hip and the knee. In quadrupeds, the hamstring is the single large tendon found behind the knee or comparable area.
The hamstrings are a group of large muscles at the back top of the thigh. They consist of the semimembranosis, the semitendinosis, and the biceps femoris muscles. If these muscles become tight, they can be easily injured.ime Frame. There is no set time frame in terms of how long it takes to gain more flexibility in the hamstrings. According to the American Council on Exercise, everyone's natural level of flexibility is different.