I started taking ballet lessons again for the first in a long time.
ーI started taking ballet lessons again for the first in a long time because of COVID. I lost some of the strength in my muscles, so it was tough but I really enjoyed it.
「コロナのため久しぶりにバレエのレッスンを再開した。筋力が落ちて大変だったけどとても楽しかった」
I started taking ballet lessons again for the first in a long time. で「久しぶりにバレエのレッスンを再開した」
to start taking ... lessons again で「…のレッスンを再開する」
for the first in a long time で「久しぶりに」
strength in one's muscles で「筋力」
ご参考まで!