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Why grip gets its own row
Most lifting apps file your forearms under "biceps". For anyone who also trains in a gi, that hides the muscles most likely to limit the week.
Most training logs account for fatigue by muscle group. Your forearms, if they appear at all, are a footnote to biceps. That is a reasonable simplification for someone who only lifts.
It stops being reasonable the moment you also grapple in a gi.
Two sessions, two different kinds of tired
A heavy deadlift day loads the posterior chain hard and leaves the hands mostly fresh, because the bar is only held for a few seconds at a time. Ninety minutes of gi rolling is the opposite: the back and hips work hard, but the grip is working almost continuously, often near its limit.
Put those two sessions in the same week and a single "recovery score" will tell you that you are tired. It will not tell you which muscles are carrying the load, and that is the only part you can act on.
What Sparlift does instead
Sparlift tracks 14 muscles separately, and forearms are one of them. Every set and every round adds load to the muscles it actually uses, and each muscle recovers on its own clock: its fatigue halves in about 24 hours for forearms and other small muscles, 36 for chest and back, and 48 for legs and glutes. A class counts by its minutes and how hard it felt, so a hard roll shows up where it happened, on the forearms and hips, instead of in one vague number.
The result is a sentence you can use, such as: legs are fresh, forearms are still loaded from last night's class, use straps on today's rows.
This is a work in progress
Nothing here is finished. The model, its parameters and the evidence behind each choice are written up in the docs as they are built. When a number is a guess, the docs say so.