Chris Martirano goes grocery shopping every weekend. When he gets back, it's all about cooking for the week. "I try to prepare all my food for the entire week. That way when I come home from the gym or from work, I don't have to worry about cooking anything or putting anything together," says the member of Patriot CrossFit in Arlington, Va. In Part 1, Martirano takes you through what he cooks to follow the Zone Diet. He even finds time for working out between marinating his chicken and mashing his sweet potatoes. "As everything is cooking I plan on doing a little bit of fun," he says. "By fun I mean some Tabata squats." In Part 2, it's time for weighing and measuring breakfast, lunch and dinner. "I have my handy scale all ready to portion my meals out," Martirano says. He follows an 18-block plan, which plays out as five blocks for breakfast, four blocks for a mid-morning snack, four more blocks for an afternoon snack and five blocks for dinner. "The day is done," Martirano says after portioning his food. "Rinse and repeat." Video by Ryan Powell.