Life Fitness 9500hr Operation Manual page 26

* Target Heart Rate (THR) is a percentage of the theoretical maximum. For example, a 40-year-old user's THR for the HEART
RATE HILL workout is 144. This workout targets 80 percent of the maximum, so the equation would be (220-40)*.80=144.
90% THR
HEART RATE HILL Workout Profile
130 THR
User Example 80 percent of theoretical maximum (40 year old / 144 recommended THR)
100% THR
95% THR
85% THR 85% THR
144 THR
137 THR
122 THR 122 THR
85% THR
122 THR