If your arms are giving out before your chest during bench pressing, it suggests that your triceps are the limiting factor in the exercise. Here are a few potential reasons and suggestions to address this issue:

1. Weak triceps: Your triceps might be comparatively weaker than your chest muscles. To address this, you can incorporate specific tricep-strengthening exercises into your routine, such as tricep dips, tricep pushdowns, close-grip bench presses, or skull crushers. By strengthening your triceps, you can improve their endurance and capacity to support your bench press.

1. Inadequate form: Improper bench press form can place more stress on the arms, causing them to fatigue faster. Ensure you maintain proper technique, including a shoulder-width grip, elbows at about a 45-degree angle, and proper bar path. Avoid flaring your elbows out excessively, as this can place more strain on the triceps.

1. Insufficient warm-up and progressive overload: Warm-up adequately before your bench press sets to ensure proper activation of all involved muscles, including the triceps. Additionally, progressively increase the weight over time to gradually challenge your triceps and promote strength gains.

1. Imbalanced muscle development: If you’ve primarily focused on chest exercises and neglected tricep-specific exercises, it can lead to imbalanced muscle development. To address this, incorporate a balanced training program that includes exercises targeting both the chest and triceps.

1. Grip width: Experiment with adjusting your grip width during bench presses. A narrower grip may shift the emphasis more towards the triceps, while a wider grip may engage the chest muscles to a greater extent. Find a grip width that allows you to engage both muscle groups effectively without excessive strain on the triceps.

Remember, it’s important to consult with a qualified fitness professional or strength and conditioning specialist who can assess your form, technique, and individual needs to provide personalized guidance. They can help you identify any specific weaknesses or imbalances and design a training program that addresses your goals and helps you improve your bench press performance.