GLP advertising and Design Toronto teamed up to create this sweat measuring t-shirt for promoting a local personal trainer named Roland Semprie. The shirt is a standard grey tee with a simple line down the center with measured increments of time. As the wearer works out at the gym, their sweat soaks into the shirt, changing the colour of the material, and displaying how long they have been working out. Yes, we realize it may not work just right, but the idea is very clever. ( See more images after the jump!)