A flexibility (forward/side bend) progress tracker: log sit-and-reach and similar tests, convert to improvement margin and rating for flexibility training tracking.
柔韧素质以坐位体前屈(cm)衡量：进步=后测−前测，相对提升=进步÷前测。正值表示柔韧改善，用于训练前后效果对比。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Improvement | improvement = post-test minus pre-test | Fitness testing practice |
| Measurement error | differences below the minimal detectable change are noise | Measurement theory |
| Protocol | standardise warm-up, footwear and push speed across tests | Fitness testing standards |
柔韧（前屈/侧屈）进步。体育竞技工具，帮助计算与分析运动数据。