Are you uncertain of what exercise to do? Well, this Back Day shirt will reveal the exercises, you just need to sweat a little (10 minute obligatory cardio just to warm up). Looks like a normal shirt until you start sweating, then the message reveals and lets you know the best back exercises. Keep pumping, keep sweating, keep motivated with this sweat activated gym shirt. Featuring Omegastretch and Ultrasoft fabric to give you the mobility and comfort you need on a workout shirt.