There is no complete list of all 150 sports modes of the Redmi Watch 4 published by Xiaomi. Instead, Xiaomi merely mentions that the watch has 150 sports modes without listing them in detail.

Health monitoring:
24/7 heart rate monitoring
Blood oxygen saturation (SpO2) measurement
Sleep monitoring with sleep phase analysis (deep, light, REM sleep)
Stress monitoring
Cycle monitoring for women

3. sports and fitness:
Over 150 sports modes
Built-in GPS for precise location tracking
Activity goals and pedometer
Calorie consumption display
Vitality score (a combination of different health metrics)

4. smart functions:
Call notifications and answering
Music control
Notifications for apps and messages
Weather forecast
Remote camera shutter release for the smartphone
Integration with Alexa (when connected to a smartphone)
Synchronisation with Google Fit, Strava and Suunto