Two HIIT sessions (each lasting 30-45 minutes long) are usually advised to do this high-intensity workout. Even if you feel like you could handle more prolonged or more frequent training, coaches don't recommend this. It's because this can lead to adverse effects such as mental burnout, overtraining, and injury. After all, your muscles don't have enough time to recover. If you're a HIIT beginner, you can use our platform to find trainers who'll help you plan your workout schedule.