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** Target Heart Rate (THR) is a percentage of the theoretical maximum (HRmax). A 40-year-old user's recommended THR for the CARDIO workout is 144, or 80 percent of the maximum; so the equation would be (220-40)*.80 = 144. HILL The Life Fitness-patented HILL workout offers a variety of configurations for interval training. Intervals are periods of intense aerobic exercise separated by regular periods of lower-intensity exercise. The WORKOUT PROFILE window represents these high and low intervals as columns of light, which together have the appearance of hills and valleys. The computerized interval training workout has been scientifically demonstrated to promote greater cardio-respiratory improvement than steady-pace training. Each HILL workout goes through four phases, each marked by different intensity levels. The WORKOUT PROFILE window displays the progress of these phases, as seen in the chart following these descriptions below. As noted in the descriptions, the heart rate should be measured at two stages in the workout to gauge its effectiveness. To do so, wear the Polar heart rate chest strap or continuously grip the Lifepulse system sensors. Note that the WORKOUT PROFILE window does not display a request for a heart rate measurement during a HILL workout. 1 Warm-up is a phase of low, gradually rising resistance, which brings the heart rate into the lower end of the target zone and increases respiration and blood flow to working muscles. 2 Plateau increases the intensity slightly, and keeps it steady, to bring the heart rate to the low end of the target zone. Check the heart rate at the end of this phase. 3 Interval Training is a series of increasingly steeper hills, alternating with valleys, or stints of recovery. The heart rate should rise to the high end of the target* zone. Check the heart rate at the end of this phase. 4 Cooldown is a low-intensity phase that allows the body to begin removing lactic acid, and other exercise by-products, which build up in muscles and contribute to soreness. Each column, as seen in the WORKOUT PROFILE window and the chart above, represents one interval. The overall duration of the workout determines the length of each interval. Each workout is made up of 20 intervals, so the duration of each interval is equal to the duration of the entire workout divided by 20. 1 to 9 minutes: A workout with a duration of less than 10 minutes is insufficient for the Hill program to complete all four phases adequately. The program, therefore, condenses a workout of this duration at various stages. 10 to 19 minutes: The interval durations initially are set at 30 seconds for a 10-minute workout. For every minute added by the user “on the fly,” each interval increases by three seconds. A 15-minute workout consists of 20 intervals at 45 seconds each. 20 to 99 minutes: All intervals last 60 seconds. If the user adds minutes to the pre-set duration while the workout is in progress, the program adds hills and valleys that are identical to the first eight intervals of the Interval Training phase. This pattern repeats until the workout is completed. HILL PLUS The Life Fitness patented HILL PLUS workouts give even more ways to vary interval training. Based on the same principles as the HILL workout, Hill Plus workouts are customized to resemble different locations/training scenarios to add variety and challenge to Hill workouts. 1) AROUND THE WORLD An interval-training workout in which the hills resemble scenes of various geographical areas. 2) CASCADES A two-peak workout in which intensity levels gradually increase and decrease. 3) FOOTHILLS A rolling hill workout with low intensity levels. 4) INTERVAL A Hill workout in which intensity levels rise and fall. The higher levels gradually incline toward a peak and then gradually decline. 5) KILIMANJARO A Hill workout in which the intensity levels gradually incline toward one ultimate peak and then gradually decline. 6) SPEED TRAINING A Hill workout in which the intensity level alternates between high and low levels very quickly to simulate a typical speed-training workout. ZONE TRAINING Zone Training workouts target specific ranges, or zones, for maintaining a heart rate to achieve maximum exercise results. 1) HEART RATE HILLTM This program combines the standard HILL workout profile with the concept of Heart Rate Zone Training. The default target heart rate* is calculated as 80 percent of the theoretical maximum† (HRmax), but the user can adjust the target rate during the workout setup. All hills and valleys are percentages of HRmax. The workout consists of three hills that target three heart rate goals: The first hill brings the heart rate to 70 percent of HRmax. The second hill increases the rate to 75 percent of HRmax. The third hill matches the Target Heart Rate brining the heart rate to 80 percent of HRmax. The valley always is defined as 65 percent of HRmax. After a standard three-minute warm-up, the workout progresses toward the first hill a...