When considering the protein source, for example, one must not only consider whether an animal - or plant - based protein will be used, but the specific organism from which it is derived (e.g., animal: chicken, beef, lamb, pork, etc.; fish: salmon, menhaden, etc.; plant: corn gluten meal, soybean meal, etc.), what part (s) of that organism will be included (e.g., plant: whole wheat vs. wheat germ vs. wheat bran; animal: entire animal vs. skeletal muscle vs. organ meats), and the form in which it will be added (animals: frozen, fresh, meal), all of which affect the diet in
terms of cost, nutrient composition and
stability, manufacturing
requirements, and ingredient handling, transport, and storage.
Since free weight exercises performed on the ground (like barbell squats) are most similar in
terms of
stability requirements to athletic ability tests (like vertical jumps), this also explains why free weights could indeed be described as «just right» in
terms of external load
stability, and therefore transfer most effectively to sport.
Thus, the minimum performance
requirement to demonstrate roll
stability performance in this final rule is expressed in
terms of a vehicle's forward speed (longitudinal velocity) at two points in time.