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Motivation is unreliable, and about half of people who intend to be active do not follow through. What predicts sticking with training is turning it into a habit, lowering the friction, and having reasons that are genuinely your own. Consistency is built by design, not summoned by willpower.
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Yes, modestly. A 139 study pooled analysis found music mostly makes exercise more enjoyable, makes a given effort feel slightly easier, and gives a small performance bump. Fast tempo beats slow. But music can't mask an all out effort, and works best for self paced moderate exercise.
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A modest tool for endurance athletes, oversold for everyone else. A pooled analysis found training guided by morning heart rate variability gave a medium improvement in submaximal fitness markers, but no real edge in race performance or VO2max over a good fixed plan.
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