You’ve heard the sayings a hundred times: ‘Abs are made in the kitchen’ or ‘the best way to get a 6 pack is with high-rep crunches, planks, and bicycle kicks until you feel the burn’.

We see members putting in serious time with those movements every week. But here’s the truth most people miss: Doing tons of reps is not the most effective way to build the strong, defined core you’re after.

Your Core Has More Potential Than You Think

Your abdominal muscles, including the rectus abdominis and obliques, aren’t purely endurance muscles. They contain a mix of fiber types:

• Type I (slow-twitch) — great for posture and holding positions over time.
• Type II (fast-twitch) — built for power, force, and growth.

Research shows a meaningful portion of your core is made up of those Type II fibers. And those are the ones with the biggest potential for hypertrophy (get thicker and more defined) when you train them properly.

High-rep, bodyweight-only work mostly targets the slow-twitch fibers and gives you muscular endurance. It creates a good burn, but it doesn’t maximize size and strength from the fast-twitch fibers that help your abs actually pop once body fat levels drop.

Train Your Core Like the Rest of Your Body

We emphasize progressive, functional training in our programs because it drives real results. The same principles that build stronger presses, squats, and pulls apply to your core.

Focus on two key approaches to target those Type II fibers effectively:

Heavier Resistance Training: Add load and keep reps in the moderate range (usually 6–12) where the last few feel challenging.

– Weighted cable crunches

– Hanging leg raises with added weights if possible

– Weighted Side Plank Dips 

– Cable chops or weighted twists

This style creates the mechanical tension needed for growth in the fast-twitch fibers, similar to how consistent curls lead to thicker biceps over time.

Explosive and Powerful Movements: Incorporate speed and force production to recruit high-threshold motor units.

– Medicine ball slams

– Rotational medicine ball throws

– TRX pikes with speed on the concentric

– Fast mountain climbers with power

These movements build the power component that translates to better lifts, improved athletic performance, and a more functional, resilient core.

At OPFC, we recommend mixing these into your routine 2–3 times per week. Keep total core volume reasonable (around 10 quality sets per week) and always prioritize progressive overload– add weight, improve control, or increase speed when it gets easier.

However, don’t ditch all stability work– planks and bird dogs still play a role for posture and deep core strength. But if visible definition is your goal, shift more emphasis toward heavier and explosive training.

Training builds the muscle. Nutrition and consistent effort lower the body fat that covers the muscle. When you combine smarter core training with solid eating habits, most people notice better strength in their big lifts and improved visual changes in the midsection.

Weight training creates lasting adaptations, i.e. bigger, stronger, more capable muscles that support you in daily life and in the gym. Take care of your core the right way today, and you’ll feel and see the difference.

Ready to upgrade how you train your abs? Next time you’re on the floor, grab some weights or a med ball instead of dropping into another long plank hold. Train your core for strength and power, not just fatigue.

If you have questions about any of this, please feel free to talk with any of us during your session, or shoot us a message. We are here to help dial in the right movements for your goals.

Yours in strength,
Nick, Tom, and Hunter