True Fitness CS8.0 Owner's Manual page 38

Unlike Constant and Interval HRC, you don't pick a target heart
rate, but you must enter your age correctly.
For the first fifth of your workout time, HRC Ultra tries to
increase your heart rate to 70% of your maximum heart rate
(HRmax) within three to four minutes.
In the middle three-fifths of your workout, HRC Ultra increases
your heart rate to 88% HRmax within three to four minutes,
and then maintains that heart rate.
During the final fifth of your workout, HRC Ultra tries to
raise your heart rate to 97% HRmax by the time you reach one
minute to go in your workout time.
Note: if you prefer lower ("less Ultra") heart rate targets in
either Ultra workout, you can reduce the targets across the
board by pressing the
HRC Ultra Workout
Chapter Seven: Heart Rate Control
key.
Time
CS8.0 Bikes Owner's Guide
HRC Ultra
Workout
38