Why do some workouts (like abs) cut down size while some (like biceps) build size?
In: Biology
So ab workouts aren’t really cutting down size per say. Basically all workouts that have to with strength/lifting are building more muscle (increasing size) but abs seem a little different for two reasons. One reason is although your abs are increasing in size, there’s typically a layer of fat that is covering it so you don’t see them increasing in size until you get to lower body fat percentages and it seems like your size is decreasing because you are losing overall body fat which decreases your overall waist line. The other reason is because there are a multitude of ab muscles. There’s the typical rectus abdominis which is the main one people are familiar with (six pack) but there is another lesser known under called the transversus abdominis that actually pulls in your ab muscles tighter to your body as it strengthens which also makes your core seem slimmer. The transversus abdominis is strengthened through your normal ab workouts but can be targeted a little more through ab workouts where you need to suck in your stomach or hold your abs tight like stomach vacuums or planks
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