Katrina and Karena, the personal trainers behind Tone It Up, know exactly how to motivate women. We especially love their “Tone It Up Transformation” board, with awesome “before and after” pictures of women who have lost weight while using their program. They’ve also pinned lots of healthy recipes, workout ideas and more…even a board full of kittens. I don’t know exactly what kittens have to do with fitness, but who cares?!