mainichi sukoshi zutsu ude o ugokashite iru uchi ni, kata ga mae yori raku ni narimashita.

As I kept moving my arms a little every day, my shoulders became better than before.

Breakdown of mainichi sukoshi zutsu ude o ugokashite iru uchi ni, kata ga mae yori raku ni narimashita.

• を: direct object particle
• が: subject particle
• 毎日まいにち: every day
• より: comparative particle

Questions & Answers about mainichi sukoshi zutsu ude o ugokashite iru uchi ni, kata ga mae yori raku ni narimashita.

What does 少しずつ mean, and why is ずつ there?

少し means a little.

ずつ adds the idea of in small increments, little by little, or bit by bit.

So 少しずつ means:

• little by little
• gradually
• a little at a time

In this sentence, it shows that the arm movement was not sudden or intense, but done in small amounts each day.

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Why is it 動かしている instead of just 動かす?

動かす is the plain dictionary form: to move something.

動かしている is the ている form, which here describes an ongoing or repeated action:

• moving
• keeping moving
• doing the action regularly

Because the sentence includes 毎日 and うちに, 動かしている suggests a continuing habit or repeated action over a period of time.

So the nuance is closer to:

• while I was moving my arms every day
• as I kept moving my arms every day

not just a one-time action.

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What does うちに mean here?