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The guy just says so without any source.
Belts make your abs and back work less and support the spine. You're not engaging more muscles by having support vs not.
I mean he even says it gives them more support than normal so you can do more work. You need a lifting belt once you've properly trained your core by lifting without one first.
All quotes from the article I already posted earlier in this thread.
Claim is that the spinal errectors will work less thoroughly with the belt
"
Moving on to squats, one study utilizing a maximal isometric leg-dominant lift in untrained people found 18% higher spinal erector EMG activity when using a belt.
Another utilizing squats with 60% 1rm found 23% higher EMG activity in the spinal erectors when wearing a belt.
Finally, two studies with well-trained subjects (8rm squat of at least 125.5kg or 1.6x bodyweight in one, and 1rm of 156kg and 1.8x bodyweight in the other) found no meaningful difference between spinal erector EMG activity when squatting with or without a belt with an 8rm load or a 90% 1rm load, while one found a small decrease when squatting a 90% load with a belt."
Doesn't seem supportive of erector spinae being less active in general with the belt.
As for abs.
"Starting with the deadlift, one study utilizing a maximal isometric back-dominant lift in untrained people found slight (nonsignificant) increases in rectus abdominis (“six pack”) activity and decreases in external oblique activation when wearing a belt.
Another study utilizing D-1 football players lifting 12rm loads had the same findings, except that the differences did reach significance.So, wearing a belt probably increases rectus abdominis activation slightly and decreases external oblique activation slightly, relative to deadlifting beltless.
Moving on to the squat, one study utilizing a maximal isometric leg-dominant lift in untrained people found significantly (54%) higher rectus abdominis activity, and slightly (14%, nonsignificant) lower external oblique activation when wearing a belt.
Two studies in well-trained lifters (lifting 8rm loads or 90% 1rm loads) found no significant differences in external oblique activation."
The evidence seems to support an INCREASE in abdominal activity, with a slight decrease in oblique (because there's less side-to-side movement). This effect seems variable, and it's not unreasonable to think that consciously cuing to flare the olbiques might mitigate the effect.