Can you spot train abs?

Spot reduction — the idea that training a specific muscle burns fat specifically from the tissue covering it — has been tested directly and doesn't hold up. Studies that had subjects train one arm or one leg for weeks found no difference in fat loss between the trained and untrained limb, even though the trained one got visibly stronger. Fat loss happens system-wide, driven by overall energy balance, not local to whichever muscle you just worked.

So what actually reveals abs

Visible abdominal definition is mostly a story about body fat percentage, not ab-specific training. The muscle can be well developed and still invisible under enough subcutaneous fat — which is the entire reason "ab exercises" alone, done consistently for months, so often produce a stronger core and no visual change at all. The two things that actually move the needle are a sustained calorie deficit (fat loss doesn't happen without one) and enough total muscle, abs included, to have something worth revealing once the fat comes down.

So is direct ab training pointless?

No — it's just doing a different job than people assume. Direct core work builds the muscle itself (more definition once fat is low enough to see it), and more importantly, a strong core is doing real, unglamorous work in almost every other lift — bracing under a heavy squat or deadlift, resisting rotation in a single-arm carry, stabilizing overhead pressing. Skipping it because "it won't get me a six-pack" misses the actual reason it's worth including.

What's actually worth doing

• Prioritize the calorie deficit if visible abs is the specific goal — no amount of core work substitutes for this.
• Train the core for strength and control (planks, anti-rotation work, weighted carries), not just endless crunch volume.
• Compound lifts (squats, deadlifts, overhead presses) already load the core heavily — direct work is additive, not the only source of core training.