Which option is a commonly recommended percentage for determining submax load from body mass?

The commonly recommended percentage for determining submax load from body mass is 50%. This percentage is often suggested because it provides a balance that allows for a reasonable intensity of load during assessments while minimizing the risk of injury, particularly for individuals who may not be accustomed to heavier weights. Using 50% of body mass as a submax load facilitates testing in a manner that can effectively measure an individual's strength and endurance capacities without pushing them to their maximal limits. This approach is particularly beneficial in assessments related to fitness and performance, as it can elicit a physiological response that is informative while still being safe for a wide population, including beginners and those rehabilitating from injury.