Your Form Score, explained.

Your first runs use shared reference patterns and the movement within each run. As you log more runs, STRIV builds a picture of your usual movement.

As enough usable history builds, your own baseline has more influence on your Form Score. It reflects both your usual movement levels and how much your steps normally vary.

Each new run is read against that existing history, then contributes to the baseline used for future runs. This helps you spot when today’s movement differs from your usual pattern.

STRIV combines foot pressure with shoe motion. The signals describe different parts of the same step:

• Timing: when the foot loads, moves toward the forefoot, and leaves the ground.
• Intensity: how strongly the shoe accelerates and how quickly loading builds.
• Stability: side-to-side movement and changes in foot orientation after landing.
• Rotation: how the shoe turns and rolls through the step.
• Pressure path: where pressure sits and how it travels across the foot.

The score looks at movement patterns, repetition, both feet, and change through the run.

• Movement pattern: comparison with reference patterns in similar running conditions.
• Step-to-step consistency: variation between neighboring steps.
• Left–right balance: comparison between nearby left and right contacts.
• Late-run change: movement relative to the earlier part of the run.

Form Score brings consistency within a run and movement relative to your personal baseline into one view. Two runs with the same number can still have different movement details.

Start with your own history. If a score changes, look at pace, terrain, shoes, and the timing or pressure details before choosing a cue. A score drop alone does not establish fatigue or its cause.

Ask Ace what changed and what to focus on next. A helpful response connects the recorded pattern with your ongoing focus, rather than asking you to chase the number.

Form Score is not a measure of race fitness, a diagnosis, or a prediction of injury. It is one way to follow running movement over time, alongside the rest of your run.