I began the "Shred It!" challenge with a lot of confusion. I did vegan challenges before where I would give up animal products for weeks at a time. I never imagined I would go this long without any turkey or eggs and feel good in the process. All I have to say is that the challenge works!
I may not have perfect muscle definition yet, but I'm closer than I ever was. Yes, 13 weeks might be enough for some people, but for me it will take a while longer. However, I can feel the muscle growth, especially in my arms and chest. A lot of the loose skin I had there is now covered with muscle. There is still some loose skin left on the arms, but I know I'm on the right track.