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A simple resistance-training program builds a repeatable routine around major muscle groups, with demands that can change as performance improves.

Thirst responds to changes in body-fluid balance, but signals from drinking can reduce the urge before water fully corrects the imbalance.

Biomechanics explains human movement through the interaction of body structures and forces, revealing the mechanics behind familiar actions.

Harmful bacteria can survive or multiply in food without changing its appearance or smell, so normal-looking food is not proof of safety.

Progressive overload adjusts training as the body adapts, keeping the challenge appropriate rather than making every workout harder by default.

BMI screens weight relative to height, but cannot distinguish muscle from fat or show where body fat sits when assessing individual health.

Protein digestion breaks food proteins into amino acids and small peptides that intestinal cells can absorb for the body’s ongoing protein turnover.

A reflex arc carries sensory information into the central nervous system and sends motor commands outward to produce an automatic response.

Nutrition Facts labels describe a stated serving, while Percent Daily Value shows how much a nutrient contributes toward a standard reference.

Metabolism links the breakdown and building of molecules through energy transfers, with ATP powering much of the work that cells perform.

Balance training becomes more demanding through changes in support and task demands, with useful progress tied to the control a person needs.

LDL and HDL carry the same cholesterol in different particles, whose behavior matters more for health than the familiar good and bad labels.