Researchers from Frontiers in Developmental Psychology tracked 66 teenage girls aged 12 to 18 for 28 days. Each morning, girls reported their exercise plans; each evening, they recorded their actual activity, mood, social support, and how safe and inviting their neighbourhood felt.
The study asked a simple but important question: what actually gets teenage girls to exercise, even when they've planned to?
Mood is the strongest predictor of whether she'll exercise
On days when girls felt more positive than usual, they were significantly more likely to follow through with their exercise plans. This wasn't about being naturally cheerful—it was about their emotional state on that particular day. Emotional wellbeing directly influenced whether they moved their bodies, suggesting that a low mood can be a genuine barrier to activity, not simply laziness.
Support from people around her makes a tangible difference
When girls received more encouragement and support from family and friends on any given day, they engaged in more physical activity. This could mean a parent exercising alongside them, a friend suggesting an activity together, or family members expressing interest in what she's doing. The effect was measurable and direct: more support led to more movement.
A safe, accessible neighbourhood encourages activity
Girls were more active on days when they perceived their surroundings as safe, attractive, and well-equipped with places to exercise or walk. This includes visible footpaths, well-lit parks, accessible swimming complexes, or gym facilities. The physical environment her body moves through matters as much as her intentions.
Support your daughter's activity by addressing all three factors
- Notice her emotional state and create a calm home environment where stress and pressure don't dominate the day.
- Exercise alongside her or express genuine interest in activities she enjoys—presence matters more than lectures.
- Identify and use safe, appealing spaces in your neighbourhood for family activity together.