What are some quick easy exercises?

my boyfriend lives in another state and he is visiting me this summer, I wanted to have really nice abs so I can wear a really sexy bikini for him…which means I have to firm up my abs cuz mine, well, yeah, you know what I mean :/ they don't look so hot. so I was wondering if anyone has any really easy quick exercises I can do to firm my abs and look really pretty for him. they can't take a long time and be hard cuz then I'll just give up and I really don't want that. also, they have to work relativly quick (like, I can see results soon) not like, perfect abs in five seconds but ya know, not like, ok abs in 3 years or something. I need something I can really see results in like, a few months. thanks

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