He is a very active person.

Action potential is an important mechanism for nerve cells to transmit information.

He is passionately engaged in extracurricular activities.

He is suspected of being involved in the sabotage of the company.

He is suspected of being involved in the sabotage of the company.

He likes watching old movies.

He is lobbying to influence politicians.

He is actively participating in social movements.

There's a proverb that says 'speak of the devil and he shall appear,' and sure enough, he showed up.

He likes to take a walk in the park at dusk.