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.
Arising from the application of physics and materials science to real-world problems, mechanical engineering is one of the oldest and most diverse engineering disciplines. Mechanical engineers design a wide variety of equipment, machinery, and devices for many different kinds of businesses.