These are the naturally slim body types which have the highest metabolic rates. These individuals are characterised by small bone structure, small shoulders, lean muscle mass, and flat chest. People with this body type find it extremely difficult to gain weight and have a faster metabolism.
Health experts recommend these individuals to consume more calories (up by 600 calories from normal recommendation) and carbohydrates. These individuals should eat more protein like turkey, chicken, lean steak, eggs, protein shakes, and fish.
Those who want a bulky look should do those workouts which are short and intense and work on big muscles of the body.