He must be going to the gym.
2 seconds sound clip from the Dragon on Shaolin Tower movie soundboard.
You can hear this line at 00:48:46.149 in the Blu-ray version of the movie.
Quote context
[...]
- Dad. How can you just divorce her?
- I thought you wanted me to do it. You've never liked her.
- I wanna stay calm. Get out now.
- Every morning recently, the master's been going out early with Ping and Chang.
- He must be going to the gym.
- I... I don't know, I just don't know what to say.
- You don't have to say anything. I see it all now.
- Please tell your father, tell him, I agree to get a divorce.
- I promise you. On the day of the contest, I will keep Suhai away from there.
[...]