best ways to tighten up loose belly flab? i lost all my pregnancy weight years ago and just havent…

best ways to tighten up loose belly flab? i lost all my pregnancy weight years ago and just havent ever had the desire to tone it all, honestly. lol between working a full-time job and raising my son it just didnt ever fit in anywhere. now that im staying home for a little bit i would love to get my body looking back the way it used to. any tips for a quick at home workout even would be great!