I mean, whatever works for you, but I don't understand that at all. You forget to exercise?
e: Not so much about forgetting, but a nag.
Personal experience: I got hooked on hitting my activity goals with my Apple Watch and am now on day 292 of my streak. I've lost 20 pounds and am running a 5k at a near 7min/mile pace, something I haven't done in over 15 years.
Sure: the watch didn't move my legs for me, but it sure as hell manipulated me into getting off my ass :)