Not all training minutes are created equal. A 60-minute jog and a 60-minute CrossFit session may last the same amount of time, but the stress they place on your body is very different. That’s why PEAK uses session modifiers.
Session modifiers are multipliers applied in the background. They don’t just measure how long you trained, but capture the true physiological stress that training placed on your body.
For example:
A steady jog may carry a modifier of 1.0 (baseline).
A heavy plyometric or high-intensity circuit might use a modifier of 1.20, reflecting 20% more stress.
A recovery walk may sit at 0.80, indicating lower-than-baseline load.
The goal isn’t to rank sessions as “better” or “worse”, but to ensure your Training Load reflects reality - how much recovery your body will actually need afterwards.
This accuracy sharpens your PEAKScore by balancing gym, field, and endurance work on the same scale. It also underpins PRiSM, PEAK’s injury-likelihood model. By tracking both volume and stress, PRiSM can surface risk patterns before they become setbacks.
In short: Session modifiers don’t just measure minutes, they measure impact, too. They ensure your training log reflects not only what you did, but the strain your body had to absorb, helping you make better-informed decisions.