Are 8 pack abs possible? If so, which muscles are involved?There seems to be a misconception that by working out more or taking steroids, you can go from a 6 to a 10 pack. That isn't exactly true.
By dieting, you can lose the belly fat and see your rectus abdominis muscle. This muscle has either 3 or 4 bands going across it, resulting in either a 8 or 10 pack. If you were born with 3 bands, the best you can do is an 8 pack, you can't grow an additional tendinous band.
You can have a strong stomach, but it will never be visible if there is fat over top. Abs are made in the kitchen. you should also be probably dehydrated as well to enhance visibility and shrink the skin thickness.
I've done the whole six pack thing. It's terrible, I wanted to do it and a buddy of mine is a professional body builder who helped me work out a diet (it wasn't a diet as much as a by the numbers spreadsheet allowing for very spicific allowances on food and water, no booze what so ever). I hated it, I looked good but I hated never being able to stop by a fast food joint and get a burger. My breakfast would be stone ground oats and a can of tuna (nothing else with the tuna) and all I wanted was some bacon. Sure I no longer can see a tight 6 pack but I'm much happier eating healthy and being hydrated. It's also nice to drink again.