I put 30 of the tiny Post-It Flags on the wall by my front door to remind me to exercise. Every time I do, I take one down. Hopefully after 30-days a new, good habit will be in place. I have also put them on my monitor at work to get out and walk on my lunch break.
I used the alarm function on my phone to remind me a few times per day (specific to each day of the week) to track my food & exercise. After a while I only remind myself with my wake up alarm. When I get off track, I go back on the reminders. It's like a nagging mother!