How big can the muscles get?

Skeletal muscle

The theoretical upper limit for muscle growth in healthy men and women is about 50% of body weight, or about 100 pounds of muscle for a 200-pound person. This limit is based on the number of muscle fibers that a person has, which is determined by genetics. However, most people will not reach this limit, even with years of training and good nutrition. The average person can expect to gain about 20-25 pounds of muscle, or about 10-12% of body weight, through resistance training.

Cardiac muscle

Cardiac muscle is the muscle that makes up the heart. It is a type of involuntary muscle, which means that it is not controlled by conscious thought. Cardiac muscle cells are smaller and less dense than skeletal muscle cells, and they do not have the same potential for growth. However, cardiac muscle can hypertrophy (increase in size) in response to exercise. This hypertrophy can help to strengthen the heart and improve its pumping ability.

Smooth muscle

Smooth muscle is the type of muscle that lines the walls of blood vessels, the digestive system, and other organs. It is also an involuntary muscle, and it does not have the same potential for growth as skeletal or cardiac muscle. However, smooth muscle can hypertrophy in response to certain stimuli, such as increased blood pressure or decreased oxygen levels.