All of the following are aspects of good biomechanical technique EXCEPT Breathing deeply through your nose and mouth.
Keeping your arms straight down at your sides without bending them
Standing nearly erect, with your head up.
Choosing a soft surface, such as a dirt road or grassy area as opposed to concrete or asphalt.

the maintenance of fluid balance during exercise. author information: fluid supplementation is necessary for exercise in which fluid losses must be offset by intake to avoid the negative effects of hypohydration on health and performance.

the gravitational force on an object increase as the mass of an object also, im not going to report you, but this question should be under the science category, not health