They work. You see them all over the internet.

“It’s the only exercise that will make you look like you just walked through a mirror.” There’s even a website: the Bridge Exercise Facebook group. And even though the concept is simple enough, it can be very difficult (if not impossible) to achieve. Some exercises require great skill in order to successfully complete. For example, many bridge exercises involve a particular set of hand-eye coordination. Some require a great deal of upper body strength …