Ten questions on how the body responds to training, food and sleep, each explained by mechanism.
The fundamentals of health and fitness are well established and remarkably stable, which makes them a useful anchor against a constant supply of new claims. This quiz covers what different training types actually do, what the main nutrients are for, and why recovery is part of training rather than a break from it. It is general information rather than personal advice, and anything specific to your own health belongs with a doctor. The explanations give the mechanism throughout.
Every question in this quiz is listed below with its correct answer and the reasoning behind it. Play first if you would rather not see the answers — or read through as a study sheet.
Play it insteadAnswer: B. The heart and lungs
Why: Sustained activity makes the heart pump more efficiently and improves oxygen delivery. Benefits appear across a wide range of intensities.
Answer: B. Muscular strength
Why: Loading muscles causes small damage that the body repairs slightly stronger. This is why progressive increases in load are needed to keep improving.
Answer: C. Activity using oxygen
Why: Aerobic activity generates energy using oxygen and can be sustained for extended periods. Anaerobic effort works without sufficient oxygen and cannot last long.
Answer: A. Repairing and building tissue including muscle
Why: Proteins supply amino acids used to rebuild tissue after training. Carbohydrate is the body's more immediate energy source.
Answer: B. Seven to nine hours
Why: Most adults need seven to nine hours, though individual requirements vary. Consistent shortfall affects concentration, mood and recovery.
Answer: B. Muscles repair and adapt
Why: Adaptation occurs during recovery rather than during the session. Training hard every day without rest tends to reduce progress rather than increase it.
Answer: D. Flexibility and range of motion
Why: Regular stretching increases how far a joint can move comfortably. Evidence that it prevents injury on its own is weaker than commonly assumed.
Answer: A. Height and weight
Why: BMI divides weight by height squared as a rough population-level screening tool. It does not distinguish muscle from fat, so it can misclassify individuals.
Answer: A. Almost all bodily functions including temperature regulation
Why: Water is involved in circulation, digestion, joint lubrication and cooling through sweat. Needs vary with climate, body size and activity.
Answer: D. One providing appropriate variety across food groups
Why: Variety helps supply the range of nutrients the body requires. Diets built on excluding entire groups tend to be harder to sustain and risk shortfalls.
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Wolff's law describes what?
Where ordinary words and objects actually came from.
The English word "salary" comes from the Latin word for which substance?