There's no question that UFC lightweight champion Anthony Pettis will be the biggest name that CM Punk trains with. And as an added bonus, Pettis' speciality, striking, is just where Punk needs to improve the most. There's no question Pettis would be a great fighter to learn from. He was extremely successful as a coach on The Ultimate Fighter, and has a shot at being one of the most memorable lightweight champions in UFC history. Punk needs to train with this guy and just become a sponge, absorbing everything he can.