Better to do light stretches before swimming with 〜た＋方がいい

シャロ:

「泳(およ)ぐなら念(ねん)のため軽(かる)くストレッチした方(ほう)がいいと思(おも)うの」

“If you're going to swim, I think you had better do some light stretching just in case.”