In a nutshell, ACWR is a stress score for training balance based on the fitness and fatigue model. It looks at both weekly and monthly load to determine if the athlete's weekly load remains within their typical training load range, based on their overall monthly load.
The fitness and fatigue model, for those that are curious, basically states that causing an athlete to be fatigued in the short term ultimately results in achieving long term fitness.
The key is to remain between 0.8 to 1.5. When you achieve this, it means the athlete is consistently training at an intensity that is at least 80% and no more than 150% of what their body is typically used to.
When using TritonWear's injury prevention tool, Load Monitoring, we will show you a river plot on the graph on your Load Monitoring page in TritonWear Insights after 28 days of consistent tracking. This area represents the target ACWR range for each athlete. Bear in mind, each individual's river plot will differ in size, and widen or broaden periodically, depending on their RPE entries and workout distances.