I have someHere are my daily haibits. Here are my daily habits.

This feels more natural.

They are working out, playing the piano and study of eing English. They are working out, playing the piano and studying English.

English has a capital letter as a proper noun. You can also translate 筋トレ to 'strength training' or 'working out with weights' if you would like to be more specific.

I work out forto improve my health. I work out to improve my health.

Putting 'improve my' makes it feel more like a full sentence. You can also put 'I work out for the health benefits.'

I can feel grow myself to play the pianothe growth of my piano playing skills. I can feel the growth of my piano playing skills.

I study eEnglish withusing Duolingo and LangCorrect. I study English using Duolingo and LangCorrect.

I also finished them today too! I also finished them today!

It's hard to describe but this feels more natural.