The SerialComm USB-TTL-33 is a high quality, high performance, USB to 3.3V TTL Converter with included terminal block and features ESD and surge protection in a 9 pin format. It is a combination of the SerialComm USB-232-2 and TTL-232-33P Converters.
The key to getting a good workout on an elliptical machine is by using your arms properly during the exercise. Stand straight rather than tilting forward to get the most benefit in your lower body. Free weights are another common and effective type of home exercise equipment. With a weight bench, a set of dumbbells and a barbell with weight plates, you can exercise every muscle in the body. Exercise balls and medicine balls also offer a whole body workout, and this exercise is very gentle on your joints and back.
VO2 max is considered to be the most valid measure of cardiorespiratory fitness. It measures the capacity of the heart, lungs, and blood to transport oxygen to the working muscles, and measures the utilization of oxygen by the muscles during exercise. One way to test is using the Rockport Fitness test.