Evolving AI on Instagram: "A developer trained a computer vision system to automatically count chin ups from video. Using Roboflow Rapid and Meta's SAM3, the model detects the chin up bar, hands, and head through natural language prompts. A simple Python script then checks when the head passes above the bar, counts completed reps, and annotates the video in real time. The same approach could power a gamified fitness app. Your workouts get tracked automatically, rep counts are saved per exercise,