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Training Data

Using data and analysis to improve: what is worth logging, what the numbers mean, and how the training-log tools compare.

2 articles

belt-systemprogresstraining-science3 min read

BJJ Belt System — What Each Belt Means (and How Long It Takes)

Every belt in BJJ represents a specific stage of development — not just time on the mat. Here's what each color actually means, how long it takes, and what to focus on at every level.

BJJtraining-logapp-comparison3 min read

The Best BJJ Training Log Apps in 2026 — In-Depth Comparison

Compare BJJ training log apps: JitsLab vs Grappling AI, BJJ Notes, MatTime, Marune, FlowRoll and BJJBuddy — features, platforms, AI coaching.