It's about timing: how density can benefit future research on the optimal dosage of acute physical exercise breaks in esports.

In recent years, organised and competitive video gaming, esports, has gained enormous popularity in many parts of the world, contributing to the growing professionalisation of this sports branch. To become or remain a professional esports player, individuals practice video gaming for several hours a day while remaining in a sitting posture which may not only lead to a decrease in training quality in the short term (eg, due to cognitive fatigue) but also put them at a higher risk for negative health events in the long-term (eg, overuse injuries). Thus, interrupting periods of prolonged video gaming in a sitting posture with acute physical exercise is strongly recommended for esports players even though the optimal dosage of acute physical exercise breaks remains unclear. To address this gap, we propose in this viewpoint that traditional concepts of exercise prescription and dosage determination using the variables frequency, intensity, time (also referred to as duration) and type of physical exercise (ie, abbreviated with the acronym FITT) should be complemented by the variable density which characterises the timing of consecutive bouts of acute physical exercise during an esports session.