LifeSpan TR3000i Owner's Manual page 50

Operations
Downhill Repeats: Decline
TR4000i and TR5500i Only
(30 minute default)
Similar to short interval decline, but with consistent incline and decline levels and
extended recovery times between changes.
Custom User Programs
There are two user programs that provide you with the ability to build custom
program profiles for your specific workout requirements. In custom user
programs you set the workout time and then for each of the 20 program
segments you set the speed and incline. This program is different than our preset
programs in that both speed and incline can be controlled simultaneously. As
such, the program matrix display readout will show both incline and speed at the
same time. The speed and incline are represented in different colors so they are
easy to see.
NOTE: Remember that the console needs to receive your heart rate
through the grip pulse or a heart rate chest strap during the course of
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the workout.