Exercise regularly, especially aerobic exercise
Add interval training if appropriate
Improve sleep duration and quality
Manage stress with relaxation techniques
Stay well hydrated
Limit caffeine and nicotine
Maintain a healthy body weight
Eat a balanced diet rich in whole foods
Reduce alcohol intake
Avoid overtraining and allow recovery
Treat underlying medical conditions
Review medications with a healthcare professional
Practice slow breathing or meditation
Monitor heart rate trends over time