The goal of this cluster randomized controlled trial is to evaluate the effects of a smartphone-based Healthy Lifestyle (HLS) intervention on firefighters' mental and physical health in firefighters in Tainan, Taiwan. The main questions it aims to answer are: * Does the Traditional Chinese version of the HLS mobile App improve firefighters' mental and physical health compared to usual care? * Can the intervention effectively promote a healthy lifestyle and reduce the risk of chronic non-communicable diseases among firefighters? Researchers will compare firefighters receiving the smartphone-based HLS intervention to those receiving usual care to determine whether the intervention leads to improved health and fitness outcomes over 3 to 6 months. Participants will: * Use the Traditional Chinese version of the HLS mobile App, originally developed at Cambridge Health Alliance, Harvard Medical School, and adapted for firefighters in Taiwan. * Be randomly assigned to either the intervention group (HLS App) or the control group (usual care). * Undergo health and fitness assessments at baseline and at 3 to 6 months post-intervention. Anticipated outcomes are improvements in mental and physical health among firefighters receiving the intervention compared to the control group.
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Blood Pressure
Timeframe: 3 to 6 months after the intervention starts
Depressive Symptoms
Timeframe: Before the intervention and 3 to 6 months after the intervention starts
Posttraumatic Stress Disorder Symptoms
Timeframe: Before the intervention and 3 to 6 months after the intervention starts
Body Mass Index (BMI)
Timeframe: Before the intervention and 3 to 6 months after the intervention starts
Smoking Habit
Timeframe: Before the intervention and 3 to 6 months after the intervention starts
Mediterranean Diet Pattern
Timeframe: Before the intervention and 3 to 6 months after the intervention starts
Overall Physical Activity Levels
Timeframe: Before the intervention and 3 to 6 months after the intervention starts
Total weekly hours spent sitting
Timeframe: Before the intervention and 3 to 6 months after the intervention starts
Average daily hours of sleep
Timeframe: Before the intervention and 3 to 6 months after the intervention starts
Frequency of siestas per week
Timeframe: Before the intervention and 3 to 6 months after the intervention starts
Glycated Hemoglobin
Timeframe: 3 to 6 months after the intervention starts
Lipid Profile
Timeframe: 3 to 6 months after the intervention starts
C-reactive protein(CRP)
Timeframe: 3 to 6 months after the intervention starts
Physical Performance
Timeframe: In the latter half of 2025