This $21 Face Sticker Stopped Me From Getting Botox. ... Turns out you can train your facial muscles to relax while you sleep. Charlotte Palermino. After using Frownies for four months.

So if you're a runner, you could place a sticker on your heart or even your arms to see how they're swinging. With a smartwatch or Fitbit, by contrast, the hardware can only be attached to the ...