There are 3 main human forms and these are: ectomorph, mesomorph and endomorph. 
If you trained and tried your best to lose or gain weight and none of it worked no matter how hard you tried, then it is very possible that you applied the wrong training or diet for your body type .
Male body type Ectomorph:
recognizable by its lean and thin body frame, long thin arms, low level of stored fat and high metabolism, it is very difficult to gain weight.
Mesomorph
Endomorf
Endomorph: round and soft body, a lot of weight is located in the abdominal region and easily store fat. Their legs are often short and rounded. The face is round.
Female body types
Hourglass Shape
These women have pronounced hips and a slim waist. They easily gain muscle and also lose fat. This body shape can be considered mesomorphic.
Apple Shape
Pear shape
This type is characterized by narrow shoulders with wide hips and thighs. The shape of a pear is actually the opposite of the shape of an apple.
Athletic shape
This body shape has no curves and these women have the so-called. a boyish look with a small waist, narrow hips and legs. This is actually a shape that many women aspire to because according to some studies, any clothing suits women with this shape. This can be considered an ectomorphic type.