ive noticed my abs gradually gain in size, definition and surface area of my stomach (like going higher and higher towards my chest to make a six pack) over the last 8 months or so by just doing mon, wed , fri 5 sets of 30 situps (thats what i do now , but when i first started the first few months i did less reps and sets).
technique is very important
i keep my arms crossed behind my back with my hands flat on my shoulder blades with my feet flat on the ground and knees bent. when i do the situp my head only lifts like half a foot to a foot or so off the ground, i focus on bringing the front bottom part of my ribcage into my body and towards my hips, then i hold at the top for one or two seconds.
i combine this with 5 sets of pushups and pullups
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