The relationship between going to failure during a workout and strength gains is a complex topic, and opinions among experts may vary. Going to failure refers to performing repetitions of an exercise until you cannot complete any more with proper form. Here are some considerations:

1. Muscle fatigue and recovery: Going to failure induces significant fatigue in the muscle being worked. This can require longer recovery time before the muscle is ready to be trained again. Insufficient recovery can potentially impede strength gains and muscle growth.

1. Individual variability: The optimal approach to training intensity, including how often to go to failure, can vary among individuals. Factors such as training experience, genetics, muscle fiber composition, and recovery capacity all play a role. Some individuals may respond well to frequent training to failure, while others may benefit more from a less intense approach.

1. Progressive overload: Consistently applying progressive overload is key to strength gains. This means gradually increasing the load, repetitions, or sets over time. While training to failure can be one way to achieve progressive overload, it is not the only method. It’s possible to make progress without going to failure in every workout.

1. Balance and injury risk: Going to failure frequently can increase the risk of overtraining and injury, especially if proper form is compromised due to fatigue. It’s important to find a balance between pushing your limits and allowing sufficient recovery to prevent injury and maintain long-term progress.

Regarding how many times to go to failure in your biceps and triceps workouts, it depends on your specific goals, preferences, and individual response to training. You may want to consider alternating between different training intensities and volume within your training program. For example, you could incorporate both workouts with higher intensity (including some sets taken to failure) and workouts with slightly lower intensity (stopping short of failure).

Listening to your body, monitoring recovery, and paying attention to signs of overtraining are crucial. It’s recommended to consult with a qualified fitness professional or trainer who can assess your individual needs, provide guidance on intensity management, and help design a program that aligns with your goals.