The mesomorph body type is characterized by a muscular and athletic physique. Some traits related to mesomorphs include:

1. Muscularity: Mesomorphs tend to have well-developed muscles, particularly in the upper body. They have a higher muscle-to-fat ratio compared to other body types.

2. Athletic Performance: Due to their natural muscular build, mesomorphs often excel in athletic activities and sports that require strength, power, and speed.

3. Metabolism: Mesomorphs typically have a fast metabolism, allowing them to burn calories more efficiently and maintain a lean body composition.

4. Weight Gain/Loss: Mesomorphs can easily gain and lose weight, depending on their diet and exercise habits. They have the ability to build muscle quickly but can also accumulate fat if their diet is not balanced.

5. Body Shape: Mesomorphs usually have a well-proportioned body shape, with broad shoulders, narrow waist, and athletic build. They often have a "V" shape physique.

In terms of revision notes, it might be helpful to focus on topics such as the different body types (ectomorph, mesomorph, endomorph), the characteristics and traits associated with each body type, and how they can influence factors like metabolism, exercise performance, and body composition.

For tests, questions may cover identifying different body types based on descriptions or images, understanding the relationship between body types and exercise/nutrition recommendations, and assessing the impact of body type on various health and fitness factors.

In terms of measurement, researchers often use somatotyping to assess body types, including the mesomorph body type. This technique involves evaluating various physical characteristics such as muscle mass, bone structure, and body fat distribution to determine an individual's somatotype. Additionally, measurements such as body mass index (BMI), body fat percentage, and waist-to-hip ratio can be used to assess body composition and overall health.