How Your Body Uses Carbs, Protein, and Fat
Macronutrients provide different metabolic options after digestion, so carbohydrate, protein, and fat do not serve interchangeable roles in the body.
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Why Your Workout Should Match Your Goal
Training specificity links exercise demands to the abilities a person wants to improve, with transfer depending on more than visual similarity.
How Your Body’s Energy Systems Work During Exercise
Exercise energy systems work together to replenish ATP, with intensity and duration shifting each pathway’s share rather than switching systems on.
How Metabolism Breaks Things Down, Builds Them Up, and Uses Energy
Metabolism links the breakdown and building of molecules through energy transfers, with ATP powering much of the work that cells perform.