For me, (sentence)

This is a good way to share your opinions or advice without pushing your ideas on other people too forcefully:

For me, my mind just doesn't work as well when I don't get enough sleep.

physical activity

"Physical activity" means exercise: running, walking, cycling, playing sports, etc.

It can also mean doing work that requires you to move around. Here are some kinds of work that count as "physical activity":

• gardening
• house cleaning
• moving furniture

some sort of (something)

The phrase "some sort of ___" is useful for describing something that you can't identify exactly. For example, if you have a strange skin problem, you can say:

I've developed some sort of rash.

If you see a man in a park who's punching and kicking the air, you can describe his actions like this:

He looks like he's practicing some sort of martial arts.

(some activity) clears (one's) head

When some activity makes you think more clearly and reduces your stress, you can say that it "clears your head":

It's well-known that meditation clears your head and helps you to relax.

What really clears my head is spending time with my family.

get (one's) creative juices flowing

People sometimes compare mental energy to a kind of liquid that flows around inside of your body. So you may hear people say things like:

We need to get up and move and get our juices flowing.

A person's "creative juices" are their ability to think creatively.