A single metric that attempts to represent both the volume and variation in your day-to-day activities.
Whilst Training Monotony helps to understand the periodisation of training and assess recovery, the volume of training (load of training over time) also needs to be considered. Too low and training will be ineffective. Too high and you’ll be moving into the realms of overtraining. Training Strain is one metric to aid with this, combining changes in load and monotony over time into one metric. The level of strain a particular athlete should be experiencing at any moment is dependent on many factors, but it can be safely said that rapid increases are bad. This would most commonly signify a rapid increase in load without adequate recovery.