健身蜕变商业广告

A cinematic 15-second fitness transformation video about weight loss and healthy lifestyle. 
Scene 1 (0-4s): Overweight young man sitting on a couch late at night, eating junk food, looking tired and unmotivated, dim lighting, realistic home environment. 
Scene 2 (4-8s): He decides to change, tying running shoes, drinking water, starting morning workout, jogging in sunrise, gym training, lifting light weights, sweating, determined facial expression. 
Scene 3 (8-12s): Healthy meal prep with vegetables, fruits, protein meals, calorie tracking on phone, energetic lifestyle. 
Scene 4 (12-15s): Final transformation reveal — fit, confident body, smiling in front of mirror, bright lighting, athletic outfit, motivational atmosphere. 

Style: ultra realistic, cinematic camera movements, smooth transitions, dynamic motion, inspirational mood, 4K, high detail, commercial fitness ad style.