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Thread count is often used as a measure of fabric quality, so that "standard" cotton thread counts are around 150 while good-quality sheets start at 180 and a count of 200 or higher is considered percale. Some, but not all, of the extremely high thread counts (typically over 500) tend to be misleading as they usually count the individual threads in "plied" yarns (a yarn that is made by twisting together multiple finer threads). For marketing purposes, a fabric with 250 two-ply yarns in both the vertical and horizontal direction could have the component threads counted to a 1000 thread count although "according to the National Textile Association (NTA), which cites the international standards group ASTM, accepted industry practice is to count each thread as one, even threads spun as two- or three-ply yarn. The Federal Trade Commission in an August 2005 letter to NTA agreed that consumers 'could be deceived or misled' by inflated thread counts. In 2002, ASTM proposed a definition for "thread count" that has been called "the industry's first formal definition for thread count". A minority on the ASTM committee argued for the higher yarn count number obtained by counting each single yarn in a plied yarn and cited as authority the provision relating to woven fabric in the Harmonized Tariff Schedule of the United States, which states each ply should be counted as one using the "average yarn number. "

The linear density of a fiber is commonly measured in units of denier or tex. Traditional units include worsted count, cotton count and yield. Tex is more likely to be used in Canada and Continental Europe , while denier remains more common in the United States and United Kingdom. The International System of Units uses kilogram per metre for linear densities; in some contexts, the tex unit is used instead.

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All About Step Aerobics. In the early 1970s, Dr. Kenneth Cooper created what we know call aerobics. Aerobics has continued to grow in popularity. Aerobics, which means "with oxygen", is a type of exercise that involves strengthening muscles, improving flexibility and cardiovascular health. Step aerobics is a form of exercise that many people have enjoyed since it came out in the 1990s. Step aerobics was based on the traditional aerobic workouts but added the use of a step into the routine. The step is generally less than 8' tall and is stepped on and off of during the routines. These steps are generally between 6' and 8' tall and can often be adjusted for different people depending on what they need and how much experience they have. The beginning stepping rate is often around 120 steps per minute. With the stepping up and down movements, you get a good cardio workout but don't put too much stress on your joints. The basic movements used in step aerobics is stepping on the step, bringing the other foot up and then bringing the feet down off the step in the same way. Most fitness experts will describe the "right basic" step as involving a step up with your right foot followed by your left, then a step down with the right foot followed by the left. To keep things interesting, step aerobics instructors also use a "left basic" step immediately after a "right basic" step. That involves tapping the feet down as opposed to shifting your weight. The "tap-free" or smooth step is one where your feet continually alternate and you skip the taps that can cause confusion. People who are new to aerobics may have trouble mastering routines including the taps. Step aerobics instructors generally try to have a plan for the switching of moves so that the movements are natural and mimic the way we move our legs when we walk normally. One move a step aerobics instructor may insert is a "knee up", which is a knee lift done when returning the foot to the ground and switching feet. A typical step aerobics workout will involve a variety of moves all lasting different lengths of time. When put together, the movements make up a class with 32 beats per set. This pace makes it easy to alternate moves and legs and work out both sides of the body equally. There are basic classes and those with some more complicated movements that may include dance like movements like a turn or stomp or other popular movements. Generally, you complete two or three routines in a class session. You learn them one by one and then put them together at the end of the class. Most step aerobics instructors try to work with all participants regardless of their abilities. The benefits of step aerobics include burning calories and losing and keeping off weight. You will burn more calories if you do a fast, long lasting and intense aerobic routine. Step aerobics can build your endurance, lower your risk of developing heart disease and improve your balance. It can also help you become more flexible and help your joints move better. Step aerobics will also improve your mental health by letting you release stress and have fun while meeting new people.