是athletic吧?
a bit 通常修饰令人不快的形容词,例如sad,silly,cold,hungry,angry,difficult,heavy,expensive等：
The song is a bit sad.这首歌有点伤感.
You might say I’m a bit silly.你可能会说我有点傻.
a little则无论褒贬都可以修饰：
Mary is a little older but a little more beautiful than Ann.玛丽比安年纪更大但是更漂亮.
Everyone seemed a little nervous.每个人看起来都有点紧张.