Most people have been doing ab workouts the same way for years — a few sets of crunches, maybe some planks, call it done. And yet most people still don’t have abs worth showing. The problem usually isn’t effort. It’s that the workout structure is wrong from the start.
A 10-minute routine that actually hits every muscle in your core — including the ones most gym-goers never touch — beats 40 minutes of random crunches almost every time. But that only happens if you know what you’re training and why the order matters.
The Four Muscles Most Ab Routines Miss
The rectus abdominis — the six-pack muscle — gets all the attention. But your core is four layers deep. The transverse abdominis wraps around your midsection like a corset and is responsible for spinal stability and that “pulled-in” look at lower body fat percentages. The internal and external obliques run diagonally across your sides, controlling rotation and lateral flexion. And the serratus anterior — the finger-like muscles that sit on your ribcage just below your armpits — is the one almost no one deliberately trains.
The serratus matters more than most people realize. When it’s developed and visible at lower body fat levels, it gives the classic V-tapered, athletic look that connects your chest and abs into one cohesive frame. You can train it in any pressing movement that involves protraction at the shoulder, or in floor exercises where you actively push your arms into the ground. Most ab routines skip this entirely.
Why Exercise Order Changes the Results You Get
The standard approach is to do whatever ab exercise sounds hardest first. That’s backwards. Exercises that involve your legs as resistance — where you’re essentially raising and controlling the weight of both limbs — are the most taxing on your core, and they fatigue fast. If you’re already tired when you get to them, you’ll compensate by letting your hip flexors take over, which defeats the point.
Starting with leg-dominant core movements while you’re fresh ensures the actual abdominal muscles do the work. Once they’re fatigued from that, upper-body and isometric work becomes the finisher — you don’t need fresh abs for a crunch variation the same way you do for a reverse crunch with both legs extended.
This sequencing principle applies to any ab routine you build. It’s not just about choosing the right exercises — it’s about putting them in the right order so each one actually trains the muscle it’s supposed to train.
The 45-15 Protocol and Why It Works for Abs
The core is an endurance muscle. It fires constantly throughout the day just to keep you upright. Training it with very short rest periods and moderate time under tension reflects how it actually functions — not like a bicep that needs 2-3 minutes of recovery between heavy sets.
Forty-five seconds of work followed by fifteen seconds of rest is a ratio that accumulates real metabolic stress without letting you completely reset between movements. Over eight exercises, that’s roughly four minutes of total working time in ten minutes. It sounds like it shouldn’t be hard. It is.
The key is that the fifteen-second window is for transitioning and breathing — not scrolling your phone or lying flat on your back. The exercises are structured so that the transition itself becomes part of the workout if you’re moving efficiently.
The Genetics Conversation Nobody Wants to Have
Some people have six divisions in their rectus abdominis. Some have four. Some have eight. That’s determined before you’re born and no amount of training changes it. What you can change is how developed those divisions are and how visible they become as you drop body fat.
This matters because it recalibrates expectations. If you’ve been grinding ab work for months and your midsection looks “close but not quite,” genetics might be part of the story — but so is body fat percentage. Abs typically become visible somewhere between 10-15% body fat for men, lower for women. That’s where nutrition becomes the ceiling that limits what any workout can deliver.
No ab routine — however well-designed — bypasses the requirement to be lean enough to see what you’ve built. The training develops the muscle. The diet reveals it. Both have to happen.
What the Video Adds
Jeff Cavaliere’s 10-minute no-equipment routine sequences all eight exercises in the order described above, with demonstrations of form cues that most written instructions can’t fully convey — especially for movements like the Backward 7s and Swipers, where the subtleties of hip position and arm placement are what separate the exercise actually working from it just being tiring. The Frog V-Up in particular is one of the more effective full-range rectus abdominis exercises you can do without equipment, and seeing the movement pattern once makes a significant difference.
At ten minutes, this is a routine you can actually run consistently. And consistency, given enough time with the nutrition dialed in, is what gets abs to show.
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