Most fitness apps overcomplicate training—with too many choices and off-the-shelf "custom" plans. GAIN gives you one clear workout every day, personalized to your body, goals, and schedule. It adapts automatically to your time, equipment, location, and missed days—so your plan always fits real life. Built over a decade with real coaches and real data, GAIN has helped 2M+ people train smarter. This is AI fitness done right—grounded in real science, not hype.