perform sports skill depends on how well the coach molds the correct ratio of endurance, strength, power and speed to meet the demands of the sport. In this section you will learn the science behind developing these important motor performance abilities as the young athlete moves through puberty...
However, the first class changed my previous understanding of tai chi. A year later, I can say that tai chi has had a huge impact on me. The first few tai chi classes were fun and easy, and the moves with descriptive names really caught my imagination, like “white crane spreading its...
and it usually occurs at or near the base of the spine, near the hips. Along this portion of the spine, the spinal cord stops, while its nerves continue down the spine. This means the nerves lack the protection of the spinal cord along the area of the...
Waste is fed into a "trash tank" (similar to a septic tank); effluent moves to a clarifier. Air (oxygen) is pumped through the system to provide oxidation and waste treatment using a variety of designs. Aerobic septic system treatment units (ATUs) are used at sites where a conventional ...
Dumbbells and barbells are free weights. They are "free," or untethered, unlike a weight machine where the weight stack is connected by cables to cams and pulleys and only moves in one direction. There are advantages to both styles of lifting. ...
The first group participated in a program of nonaerobic (无氧) exercise—balance training and weight training—three times a week. The second group did high-intensity aerobic exercise under the guidance of a trainer for four or more days a week. After two years, the second group saw ...
Coffee-loving athletes: you're in luck.3The all-natural caffeine in coffee has been associated with improved physical performance, especially in aerobic (有氧的)or endurance exercise. The recommended amount of caffeine is 2-6 milligrams per kilogram of body weight.4 ...
Step-through frame:This is the old-fashioned "ladies" bike where the top tube (crossbar) is low (in comparison to a diamond frame). Traditionally this was used so women wearing skirts could get on their bikes by stepping through the middle of the bike. Step-through designs are typically ...