Question: Is there a fitness app that uses AI to optimize nutrition and provide a tailored training plan for weight loss and muscle gain?

If you want a fitness app that goes all out with AI-powered nutrition advice and personalized training plans for weight loss and muscle building, Strongr Fastr is a good option. The app generates a meal plan and workout training plan to help you meet your nutrition and fitness goals. With a weekly meal plan, shopping list generation and scientifically validated workout routines that adjust based on your performance, it's good for people at all levels of fitness.

Another contender is Alter, which marries genetic data from DNA tests with biometric data from wearables to offer customized workout and nutrition plans. It offers daily workouts, recovery plans and DNA-based nutrition advice, along with real-time heart rate monitoring and AI-powered form correction while you're exercising. It's good for people who want a more personal approach to fitness.

If you want something more integrated, check out Rex. This AI-powered nutrition and fitness coach uses photos of meals and text messages to offer personalized calorie counting and workout advice. Rex also offers body fat and muscle mass measurements and daily reports with diet and exercise advice, so it's a good digital coach for weight loss, muscle gain and overall health.

Finally, Body Scan takes a different approach by generating personalized workouts based on a selfie and personal statistics. It offers detailed body composition analysis and nutrition advice, along with video workouts tailored to your goals. It's free to use and offers a data-driven approach to fitness without requiring a gym membership or personal trainer.