Athletes typically ride about 7-8 stages, or until a break point in your blood lactate values has been distinguished. This break point area is known as your lactate threshold. You are said to have crossed lactate threshold when blood lactate concentration increases by at least 1 mmol/L in two consecutive stages.
Middle class. The middle class is a class of people in the middle of a social hierarchy. In Weberian socio-economic terms, the middle class is the broad group of people in contemporary society who fall socio-economically between the working class and upper class. The common measures of what constitutes middle class vary significantly among cultures. A sizable and healthy middle-class can be viewed as a characteristic of a healthy society.
Itâs actually harder to define a middle class income that you might expect. Economic Percentile: Rather than just looking at arbitrary cutoffs, some economists consider middle class according to percentile. If you are in the top 20% of income earners, you are considered to have an upper class income, or be rich. Those whose incomes fall in the bottom 20% are considered poor. Everyone else (the middle 60%) is middle class.