Whats the secret behind body development? I mean how is it that some people have larger body frame then others?

We have known for quite some time now in bodybuilding that different body types respond differently to both training and nutrition. As a result, it is incredibly important to be aware of what your body type is so that you can design a training and workout program accordingly.

The basics of body types are listed below:

The ECTOMORPH
Definitive "Hard Gainer"
Delicate Built Body
Flat Chest
Fragile
Lean
Lightly Muscled
Small Shouldered
Takes Longer to Gain Muscle
Thin

The extreme ectomorph physique is a fragile and delicate one. The bones are light, joints are small and muscles are slight. The limbs are relatively long in proportion and the shoulders droop. The ectomorph is a linear physique. Straight up and straight down, and may appear longer than he or she really is, due to the length of limbs coupled with lack of muscle mass developed on those limbs. The ectomorph is not naturally powerful and will have to work hard for every ounce of muscle and every bit of strength he or she can gain.

The MESOMORPH
Athletic
Hard Body
Hourglass Shaped (Female)
Rectangular Shaped (Male)
Mature Muscle Mass
Muscular Body
Excellent Posture
Gains Muscle Easily
Gains Fat More Easily Than Ectomorphs
Thick Skin

The mesomorph has well-defined muscles and large bones. The torso tapers to a relatively narrow and low waist. The bones and muscles of the head are prominent. Features of the face are clearly defined, such as cheek bones and a square, heavy jaw. The face is long and broad, and is cubicle in shape. Arms and legs are developed and even the digits of the hand are muscled.

Endomorph
Soft Body
Underdeveloped Muscles
Round Physique
Weight Loss is Difficult
Gains Muscle Easily Like the Mesomorph.

The body of the extreme endomorph is round and soft. The physique presents the illusion that much of the mass has been concentrated in the abdominal area. This may or may not be true. The arms and legs of the extreme endomorph are short in length and taper. This may give the appearance of stalkiness. The hands and feet of the endomorph are comparatively small, and the upper arms and thighs are often more developed than the lower parts of the arms or legs. The body has a high waist.

Combinations of Body Types
Very often, people cannot be easily classed as one of the three main body types. Although there are some people who are purely ectomorphs, endomorphs, or mesomorphs with little or no characteristics of the other body types, very frequently, people fall into mixed categories, such as ecto mesomorphs, or endo mesomorphs, where largely, they are like the mesomoph, but with traits of the ectomorph (such as small joints or a trim waist), or traits of the endomorph (such as a tendency to gain fat easily).