Day Strain is a measure of the strain you have accumulated over the course of an entire day. While individual workouts receive Strain to indicate your level of cardiovascular effort for that discrete period of time, Day Strain provides you with a full picture of the Strain you are putting on your body each day.
Day Strain is very useful in determining what non-exercise activities are contributing the most to your accumulated Strain. This statistic can help you better plan your days leading up to a competition, or can help identify activities during your day that may be contributing to elevated Strain. In addition, Day Strain gives you credit for activities you may not consider to be “workouts”, such as your daily commute.