Knowing your body type is essential to custom workouts for you, along with a proper diet to help balance your body progression. The 3 body types are: ectomorph, endomorph and mesomorph.
Ectomorph
Typically lean body and long limbs; hard to gain weight and muscle. Ectomorphs have fast metabolisms and burn calories rapidly. To maintain and increase muscle mass and weight gain, ectomorphs are encouraged to increase their calorie intake, and eat before going to bed to avoid muscles to deteriorate and breakdown. Workouts consists of short, intense reps, with cardio kept to a minimum so as not to lose muscle and burn more calories.
Endomorph
Solid, soft and round body; easily gains weight and muscle. Endomorphs have a slow metabolism and can store fat easily. Fat distribution is somewhat different between male and female endomorphs, where men store fat in their mid-section, whereas women typically store fat in the hips, legs and buttocks regions of their bodies. Cardio and weight-lifting are ideal for endomorphs. The physicality and constant, active movement from cardio allows endomorphs to burn more calories. Weight-lifting allows those fat cells to form into muscle.
Mesomorph
Hard, heavy bone structure and large muscles; naturally strong. Because mesomorphs are so strong, they can easily gain muscle and are typically athletic. They can also gain fat very easily, which means they must be wary of their calorie intake. However, to maintain and keep muscle, they must incorporate protein regularly in their diet. Just as endomorphs, mesomorphs workouts should consists of heavy weight-lifting and cardio.