1. Start recording/streaming
2. Open the Training Grounds adventure (from the map) right after you press the timer button
3. Immediately run to where Liza will be as fast as possible. She appears about a second after the adventure starts
4. Click on the action icon above Liza
5. Quickly click the 'x' icon in the top right corner of Liza's speech box
6. Run past the phantom
7. Repeat steps 4 and 5 and move on to step 8
8. Get the first two phantoms to notice you then run to the patch of purple flowers to the right of the farthest right fencepost where the top phantom resides. This will cause both phantoms to be eaten by chomper plants
9. After that, get the next two phantoms to notice you then run to the patch of purple flowers above the left chomper plant. This will cause both phantoms to be eaten by chomper plants
10. Repeat steps 4 and 5 then move on to step 11
11. Run through left side of the tall grass diagonally until you see the path turn.
12. Keep going your original direction behind a pair of phantoms (getting hit won't cost you time) until you are near the border of the adventure (the trees that prevent you from leaving the Training Grounds) and turn
13. Repeat steps 4 and 5 then move on to step 14
14. Click the action button above the treasure chest then open the chest and press okay
15. Exit the adventure through the portal and stop your timer

NOTES:

1. Review the rules before attempting this run
2. There is a specific spot near the end of the adventure where you can talk to Liza and open the chest from the same spot which would theoretically be faster, but you'd have to be insanely lucky in order to get the right spot during a run, so I can't recommend it.