To be honest, I have yet to find a quality mass gainer on the market. The problem with most mass gainers is that they are loaded with cheap sugars as a carb source. Not only can this lead to greater fat gain, it can make drinking them several times a day unhealthy.
Mechanical stress: physical condition which exists within any material because of strain or deformation by external forces or by non-uniform thermal expansion.
Stress = Force/Area. Strain = A change in shape or volume in response to a stress. Stress is the cause, strain is the effect! There are three types of stress : 1) Compressive stress Forces that squeeze or push toward one another from opposite directions (cause shortening or flattening).