What are some good proven men’s ab exercises WITHOUT MACHINES that will guarantee 6- pack abs?

I’m only 15. I like to work out.

However, the abs have been a bit tricky to build up though.

My waist is skinny and I always joke with myself that I only have 2-4 pack abs. lol

Thanks
I’ve got a good build for the rest of my body.

Just those abs……………………………………………
what about using weights for situps?

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