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The Most Challenging Core Workout You’ll Ever Try – Transform Your Abs in Weeks With These 4 Advanced Exercises

 Written by 

Julien Raby

 Last updated on 

Ready to sculpt a strong six-pack? Alec Blenis, a top hybrid athlete, reveals his advanced core exercises and essential technique tips to push your limits and maximize your core strength. 

From GHD sit-ups to cable twists, each exercise is meticulously explained to enhance your workout. Whether you’re a beginner or advanced athlete, discover how to scale these movements for your fitness level and achieve impressive results. 

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Dive into Alec’s expert insights and transform your core workouts today!

GHD Sit-Up

Alec begins with the classic GHD sit-up, emphasizing the importance of proper technique for maximum benefit.

Technique Tips:

  • Lumbar Support: Position your body so that the pad supports your lower back, allowing you to push into the pad with your back.
  • Crunch Focus: Instead of lifting with your head or chest, focus on bringing your ribs towards your pelvis. This enhances the contraction of your core muscles.
  • Adding Weight: For an extra challenge, hold a weight at your collarbone or just below your chin. Avoid throwing the weight; instead, use controlled movements to crunch.
  • Breathing: Expand your rib cage on the way down with a big inhale, then crunch on the way up with a controlled exhale.


  • Beginners: Start with body weight and focus on form. Aim for 2-3 sets of 10-15 reps.
  • Advanced: Incorporate weights and aim for 3-4 sets of 15-20 reps. Experiment with varying the eccentric phase by reaching the dumbbell towards your forehead for added intensity.

Reverse GHD Sit-Up

Next, Alec introduces the reverse GHD sit-up, a challenging exercise targeting the upper abs and respiratory muscles.

Technique Tips:

  • Positioning: Lie back with your upper back on the support, and your legs hanging down. Initiate the movement by lifting your knees towards your elbows.
  • Control: Focus on a slow and controlled eccentric phase, lowering your legs gradually.
  • Modifications: Adjust the machine for more support if needed. Extend your legs for added difficulty, making the eccentric phase tougher.


  • Beginners: Start with support adjustments to make the exercise easier. Aim for 2-3 sets of 5-10 reps.
  • Advanced: Incorporate straight leg movements and aim for 3-4 sets of 8-12 reps. Try the GHD dragon flag variation for an extreme challenge.

Cable Twist

Alec then moves on to the cable twist, an effective exercise for the obliques and overall core stability.

Technique Tips:

  • Optimal Setup: Position yourself at a 45-degree angle to the machine. This setup maintains tension throughout the movement, making the stretch position challenging.
  • Execution: Focus on a big stretch at the start and twist across your body, maintaining control and tension.


  • Explosive Training: Incorporate faster, more explosive movements to prepare your core for real-life forces. Aim for 3-4 sets of 10-15 reps with moderate weight.
  • Heavy Training: Use heavier weights for a lower rep range (3-6 reps) to build strength.

45-Degree Side Bend

Finally, Alec introduces the 45-degree side bend, targeting the obliques, lower back, and hips.

Technique Tips:

  • Body Positioning: Place your body on the bench at a 45-degree angle, with a focus on a large range of motion.
  • Hand Placement: Start with hands at your sides, then progress to hands behind your head or overhead for increased difficulty.


  • Beginners: Start with hands at your sides and aim for 2-3 sets of 10-15 reps.
  • Advanced: Progress to overhead variations and aim for 3-4 sets of 15-20 reps. Add weights for additional resistance.

Watch the Full Video:


These exercises, demonstrated by Alec Blenis, provide a comprehensive approach to building a strong and defined core. Whether you’re a beginner or an advanced athlete, these movements can be scaled to fit your fitness level. Try them out and track your progress.

Don’t forget to follow Alec Blenis on social media for more fitness tips and inspiration.

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