Объяснение:

Susie says she hasn't seen Jack all summer.

Jack feels great.

He decided to lose weight.

Jack knew that going to the gym would be hard.

At the beginning of the holidays, his clothes didn't fit him.

Jack felt nervous before his first visit to the gym.

On Jack's first visit, he found that the people at the gym were friendly.

Now Jack goes to the gym three times a week.

Most of Jack's summer clothes are too small for him now.

On Saturday mornings, he runs in the park with his friends.