I did a lot of training the first time, so I don't think I need to do as much the second time.
I worked out really hard the first time, so I can do a lighter workout the second time, can't I?
ーI did a lot of training the first time, so I don't think I need to do as much the second time.
「１回目にたくさんトレーニングしたから、２回目はそこまでする必要ないよね。」
do a lot of training で「たくさんトレーニングをする」
一回目は first time, 2回目は second time のように言えます。
ーI worked out really hard the first time, so I can do a lighter workout the second time, can't I?
「１回目にかなりハードにトレーニングしたから、２回目はちょっと軽めのトレーニングでいいよね？」
work out really hard で「かなりハードにトレーニングする」
do a lighter workout で「少し軽めのトレーニングをする」
ご参考まで！
カナダ 
