That's as may be, but how fast does your HR return to normal when you stop?
"A greater reduction in heart rate after exercise during the reference period is associated with a higher level of cardiac fitness......Heart rates assessed during treadmill stress test that do not drop by more than 12 bpm one minute after stopping exercise (if cool-down period after exercise) or by more than 18 bpm one minute after stopping exercise (if no cool-down period and supine position as soon as possible) are associated with an increased risk of death."
Usually I'll cool down straight after so it drops gradually, but if I stop abruptly it gets to about 90bpm in under a minute if I just stroll around a bit.