Hypertrophy is defined as an increase in the size of cells, tissue, or organs in the body, and in the context of exercise, it refers to an increase in muscular size achieved through exercise. Hypertrophy training is a type of resistance training that focuses on moderate weight and moderate repetitions, with a 1-minute rest period between sets. There are two types of muscular hypertrophy: myofibrillar and sarcoplasmic, which refer to the growth of muscle contraction parts and increased muscle glycogen storage, respectively. Both mechanical damage and metabolic fatigue are important for achieving muscular hypertrophy.

Hypertrophy can be achieved through exercise, and weightlifting is the most common way to increase hypertrophy. However, it is important to note that hypertrophy training should not be jumped into immediately, and a strong foundation should be developed first. Hypertrophy training is commonly used by bodybuilders who want to reach maximum muscle size, and athletes will also use this form of training to quickly boost strength and mass.

It is also worth noting that there is a medical condition called myostatin-related muscular hypertrophy, which is a rare genetic condition that results in reduced body fat and increased muscular size.

In summary, hypertrophy is an increase in muscle size achieved through exercise, and it can be achieved through weightlifting and other forms of resistance training. It is commonly used by bodybuilders and athletes to increase muscle size and strength.