Lipids, a chemical family that includes cholesterol and fat, make up a major part of the average human diet. At 9 calories per gram -- compared to 4 calories per gram of carbohydrates and proteins -- fats serve as concentrated sources of energy to fuel your active lifestyle.
The Development of Rowing Equipment By Bill Miller This page contains information about the development of rowing equipment beginning about the end of the 18th century.
Less Directly: Triceps, pecs (chest muscles), abs (frontal and obliques). The main role these muscles serve in rowing is as a stabilizer, so that you maintain proper posture while rowing (because it can be rough on your back if you don't do it right).