A mesomorph type is a strong, muscular athletic body. This body type is able to burn fat easily and add muscle. This is due to a high metabolism. The shape of this type of body is rectangular, roughly the same width at the shoulders, waist and hips.
Potential problems with a mesomorph body is the potential of oversized muscles and having too much body fat. To avoid this problem, focus on more repetitions with lighter weight to slenderize your muscular figure.