Spirit XT685 Owner's Manual page 32

Incline: The elevation in this program is moderate. There are
several elevation spikes at different points of the workout.
Segment 15 is maximum elevation for this program.
Strength
This program has a gradual progression of resistance up to 100% of maximum effort that is sustained for 25% of workout
duration. This will help build strength and muscular endurance
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in the lower body and glutes. A brief cool down follows
Incline: There is a quick climb to a moderate, sustained
elevation that lasts the majority of the workout length.
Interval
This program takes you through high levels of intensity followed by recovery periods of low intensity. This program
utilizes and develops your "Fast Twitch" muscle fibers which are used when performing tasks that are intense and short
in duration. These deplete your oxygen level and spike your heart rate, followed by periods of recovery and heart rate
drop to replenish oxygen. Your cardiovascular system gets
programmed to use oxygen more efficiently.
Incline: This program will spike similar to the speed profile,
but in different segments (columns); this means that all of
your lower extremity muscles will be equally challenged
throughout this program. The incline alternates between 25 &
65 % of maximum elevation.
Calories
Resistance: This program follows a quick progression up to the maximum speed level (default or user input level) that is
sustained for 2/3 of the workout. This program will challenge your ability to sustain your energy output for an extended
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period of time.