What percentage of a person's total body weight is typically made up of water?

The correct choice indicates that typically 40-60% of a person's total body weight is comprised of water. This percentage can vary depending on several factors, including age, sex, and body composition. Generally, the human body is made up of a significant amount of water, with different tissues containing varying amounts. For instance, muscle tissue is roughly 75% water, while fat tissue is about 10-15% water.

In adults, water makes up closer to 50-65% of total body weight, with percentages being slightly higher in infants and lower in the elderly due to changes in body composition over the lifespan. This vital statistic underscores the importance of hydration for maintaining bodily functions, such as temperature regulation, nutrient transport, and waste elimination. Understanding that 40-60% range as standard helps to inform training, nutrition, and hydration strategies in personal training contexts.