Spirit 16007602850 Owner's Manual page 22

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 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
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