Do you train hard and see little in the way of muscle gain? How about an endless toil in the gym, struggling to lose fat? The chances are, you're going about it all wrong. The real way to hit your training goals is adapting your plan to your body type.
Men can generally be classed as one of three body types.
Ectomorphs: skinny guys that struggle to gain weight. They're your classic “hard-gainers”.
Endomorphs: large-bodied and generally soft, these bodies gain bulk easily but also store fat along the way.
Mesomorphs: the ones everybody envy because they're naturally lean and athletic. They can put on muscle comparatively easily and they don't require huge amounts of maintenance.