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力を入れて

put effort into; exert oneself

→ 力
phrase Rare #36,770
put effort into; exert oneself Used both literally for applying physical force or tensing a body part and figuratively for focusing effort on something. In the past-tense form 力を入れた, it can mean “put the most effort into.”
JA: 試験のために、毎日数学の勉強に力を入れています。
EN: I’m putting a lot of effort into studying math every day for the exam.

もっと力を入れて勉強始めないといけないかな。

I wonder if I need to buckle down and start studying harder.

もっと腹に力を入れて

Engage your core more.

— ジョジョ・ラビット (2019)

お腹にぐっと力を入れて、歌うようにしてみましょう。

Engage your core and try singing it out.