Yes—movement sensors can undercount cycling, so a ride diary can help fill gaps in your activity record. That is the practical takeaway for our Outdoor Cycling community from this source excerpt. The Paracelsus 10,000 study looked at exercise and heart-and-lung fitness in men and women. The authors flagged a tracking problem: cycling was not captured well by movement sensors. They recommended a sports diary to better record it. In the study, 132 men reported cycling at least 10 minutes weekly. That was 34.6% of the men. Among women, 105 reported that amount, or 29.6%. The authors compared this with a separate survey. There, 37.8% of men and 29.6% of women reported the same weekly minimum. These numbers show how many people reported riding, not how much fitness improved. Ten minutes was a reporting cutoff, not a proven exercise target. The excerpt also does not say what share of cycling time sensors missed. It does not show that every watch or bike computer has this problem. For members, the useful point is about making records more complete. A weekly activity total may leave out part of your riding habit. Keeping ride minutes alongside device totals could make those gaps easier to spot. Notes about effort and route could also add context when comparing weeks. Sharing those records on BioSocial can make community comparisons more useful. It helps separate what you did from what your device recorded. What differences have you noticed between your logged rides and your device’s activity totals?