Ruuskanen et al. 2024, Exercise during viral respiratory illness

Review of exercising during viral respiratory illness. The “neck check” (train cautiously with above-the-neck symptoms, stop with below-the-neck or systemic ones) is widely repeated clinical lore with no trial backing. The firm guidance is to avoid training with fever or systemic illness because of the rare but serious risk of myocarditis; sudden cardiac death from myocarditis is rare in absolute terms, and common-cold viruses are not cardiotropic. Return after illness should be graded. Moderate.