Purpose: Preschool-aged children, especially girls, have low levels of physical activity that may be influenced through parent role modeling. Evidence for mother–daughter interventions that include preschool-aged children is sparse. The primary purpose of this study was to examine the feasibility of recruitment procedures, protocol compliance, and participant retention for the Mothers and Daughters Moving Together intervention. The secondary aim was to provide initial estimates of the intervention effect on mother–daughter and family physical activity co-participation, moderate to vigorous physical activity, and maternal physical activity enjoyment and support. Method: This nonrandomized feasibility study included mother–daughter (2–5 y) dyads who self-selected into the intervention (n = 21 dyads) or comparison (n = 10 dyads) group. Results: The recruitment rate was 41.9% (31 enrolled/74 interested). Intervention group mother–daughter dyads attended 57% of intervention sessions. Among the whole sample, 70% to 80% of participants (mothers and daughters) had at least 4 valid days of accelerometer data at preintervention and postintervention. The retention rate was 90% (28/31 dyads completed the study). Initial estimates of intervention effect indicated small, positive changes for mother–daughter physical activity co-participation, and maternal physical activity support and enjoyment. Conclusions: This study provides valuable information that should be confirmed using an adequately powered and randomized study design.

目的：学龄前儿童，尤其是女孩，身体活动水平低，可能会受到父母角色榜样的影响。包括学龄前儿童在内的母女干预的证据很少。本研究的主要目的是检查母亲和女儿一起移动干预的招募程序、协议合规性和参与者保留的可行性。次要目的是提供对母女和家庭体育活动共同参与、中度到剧烈体育活动以及母亲体育活动享受和支持的干预效果的初步估计。方法：这项非随机可行性研究包括自选进入干预组（n = 21 对）或比较组（n = 10 对）的母女（2-5 岁）二人组。结果：录用率为41.9%（31人报名/74人有兴趣）。干预组母女二人组参加了 57% 的干预会议。在整个样本中，70% 到 80% 的参与者（母亲和女儿）在干预前和干预后至少有 4 天的加速度计数据有效。保留率为 90%（28/31 对完成了研究）。干预效果的初步估计表明，母女身体活动共同参与以及母亲身体活动的支持和享受发生了微小的积极变化。结论：这项研究提供了有价值的信息，应该使用充分有力的随机研究设计来确认这些信息。