Alerting on Samsung Galaxy FIT 3

Hello. I am looking for a cheap way to get notified to move with something vibrating on my wrist. Don't really care about anything else, and it seems that a Samsung Galaxy FIT 3 would do the job. What I don't want is to have loads of other notifications though, eg receiving text messages, whatsapp, emails etc. Wondering if anyone here has one? Is it possible just to have it notify me of inactivity and nothing else? Thanks!