I've got to stay in shape. Look at all those cute tops that I used to fit into.

我要保持身材。看这些漂亮的上衣,我以前都能穿上的。

Come on, you just put on some weight, it's no big deal.

拜托，你只是胖了一点，没什么大不了的。

重点讲解:

I want to keep a good figure.

I've got to stay in shape.

夏天到了，女孩子们都想keep a good figure “保持身材”，figure作名词有 “身材，体形”的意思。但在口语中表达“保持身材”更常用stay in shape, in shape就表示“在外形上处于良好的状态”。