Boost Lower Pec Size with Tonio Burton’s Cable Fly Approach

Hey, it’s RockyBuilder, and let’s fix that lagging lower chest using Tonio Burton’s smart cable fly strategy. You’ve probably noticed that your lower chest isn’t developing as quickly as the rest of your pecs. This is a common issue even experienced lifters run into: stubborn lower chest gaps. Recently, expert bodybuilder Tonio Burton shared fresh insights into why his cable fly approach has become key for unlocking lower pec growth, and how you can apply it safely and effectively.

Targeted Pec Growth​

Most lifters struggle with lower chest development, creating an imbalance in the overall pec shape. While many exercises hit the upper and mid chest well, the lower fibers are often under-stimulated. That’s where Burton’s cable fly technique comes in, strategically designed to target the sternal head fibers that traditional presses miss.

Burton, a four-time Mr. Olympia finalist and the 2025 Mexico Pro winner, recently emphasized that the “high-to-low cable fly” is one of his go-to moves for building mass in the lower pecs. He’s even experimenting with seated variations to enhance muscle activation and reduce stabilization demands from other muscle groups.

Understanding the Lower Chest Anatomy​

The pectoralis major has two main sections: the clavicular (upper) head and the sternal (lower) head. Lower chest fibers run upward from the bottom of the sternum toward the shoulder, giving a fuller and more complete chest appearance when fully developed.

Because many standard chest exercises (like flat and incline presses) do not emphasize the downward arm path needed for sternal head activation, targeted isolation moves like Burton’s cable fly variations are essential.

Why Cable Fly Is Ideal for Lower Pec Growth​

Cable flyes provide constant mechanical tension through the full range of motion, meaning the targeted muscle must stay engaged from stretch to peak contraction. This consistent resistance is crucial for hypertrophy.

Cables also allow you to fine-tune the resistance path, focusing exactly on the lower pec fibers. With adjustable pulley height, you can emphasize different angles of fiber recruitment that traditional pressing patterns struggle to isolate.

Another benefit Burton highlights is the opportunity cables give you to deepen the mind-muscle connection, especially when performed with moderate weights and strict form.

Tonio Burton’s High-to-Low Cable Setup​

Recently, Burton shared updated cues on how to get the most from this setup. His recommendations include:

• Set pulleys above shoulder height so the line of resistance travels high-to-low.
  
  
• Lean forward slightly from the hips to pre-stretch the pecs and engage the lower sternal fibers early.
  
  
• Use a neutral grip on D handles, with thumbs angled slightly up, creating ideal shoulder positioning for chest isolation.
  
  
• Choose weights that allow controlled reps — too heavy and the movement becomes a press rather than a fly.

Seated vs. Standing Cable Fly​

In the latest guidance Burton shared, he mentioned trying seated high-to-low cable flys during some sessions. The idea is that sitting reduces stability demands on the core and legs, allowing the chest to do the bulk of the work, which may enhance lower pec recruitment for some people.

Key Points​

• Standing variation forces more stabilization but engages the full body.
  
  
• Seated variation can help you isolate the pecs further by minimizing compensatory movement.
  

The Decline Cable Fly Variation​

Alongside the high-to-low method, traditional decline cable flys remain a powerful option. This variation puts your torso at a slight decline and emphasizes the lower sternal fibers more directly.

Focus on strict form: lower the handles with a slow, controlled eccentric phase (about 3–4 seconds), and drive the handles up without using momentum. This increases time under tension, a key driver of muscle growth.

Programming for Lower Chest Size​

To build a bigger lower chest, structure your training around these principles:

• Weekly volume: ~10–15 sets focusing on lower pec work.
  
  
• Reps: 8–12 per set at a weight you can control.
  
  
• Rest: 60–90 seconds between sets to balance recovery and pump.
  
  
• Frequency: Target lower chest twice per week, once as a primary movement and once as a finish.
  

Progressive Overload Strategies​

Progressive overload remains essential, even with isolation movements:

• Add weight incrementally when you can maintain a full range of motion.
  
  
• Slow the eccentric phase or pause at peak contraction to increase time under tension.
  
  
• Consider drop sets or mechanical drops by slightly altering cable height to keep tension high throughout.
  

Avoiding Common Mistakes​

To truly grow the lower chest:

• Don’t load weights so heavy that form breaks down.
  
  
• Maintain a full range of motion, especially at the stretch.
  
  
• Focus on the mind-muscle connection, feeling the lower pecs work, not just moving weight.
  
  
• Avoid rushing reps; faster tempos cut short the time under tension.
  

Sample Lower Chest Finisher​

A powerful finisher Burton endorses (based on his recent tips):

• 3–4 sets high-to-low cable flys
  
  
• 10–12 reps controlled with a 2:1:2 tempo (lower 2 sec, pause 1 sec, raise 2 sec)
  
  
• 45–60 seconds rest between sets to keep the pump strong and technique clean.
  

Final Word​

The latest guidance from Tonio Burton reinforces that high-to-low cable flys and variations like seated and decline flys are among the best tools you have for targeting stubborn lower pec fibers. By focusing on tension, controlled motion, and smart programming rather than just heavy loads, you’ll build fuller lower chest development that balances your physique.

This updated approach blends Burton’s pro-level insight with current best practices shared in today’s fitness news, giving you the clearest path forward for boosting lower pec size in 2026.