True Fitness Treadmill ES9.0 + ES7.0 Owner's Manual page 11

Quick Workout Keys [walk, walk+run, run]
Use these keys to set up your favorite training speeds.
While the treadmill is operating in manual mode, pressing and
holding either the walk or run key will "save" that speed as that
key's operating speed. Pressing that key will change the treadmill
speed to that speed.
Note: you can't set a higher speed for the walk key than is set in
the run key. Tip: set the walk key speed first.
The walk+run key uses the speeds set in the walk and run keys
in an interval workout pattern. It alternates every 60 seconds
between the walk speed and the run speed.
Before you customize these keys, the walk key is set to 3 mph,
and the run key is set to 6 mph.
Manual & Quick Workouts
Chapter One: Basic Operation
ES Treadmills Owner's Guide
Custom
Quick
Workouts
11