The song with the lyrics about coming and going and dropping the flab is for square dancing.

There is a square dance song called "Burn the Vegetables,"

Lyrics: Cui Jie, Composer: Zhao Jialin, Performed by Bai Kenan

Some of the lyrics are:

"Weird uncles and bad sisters come together

Old grandpas and grandmas sway together

All mankind loves sports and vegetables

Dump the Fat leave high protein

Burn it burn it blood surging

Sing up and dance everywhere is the stage

Burn it burn it be a happy vegetable

Healthy growth every day wonderful to the future"

Is this the one you're asking about?