Eat enough - It is important that you eat nutritious and healthy food, especially protein. High-intensity exercise can cause damage to the muscles of your body. You should eat enough to repair and grow the muscles. You would need protein every 2-4 hours to stay fueled all the time. Clarify doubts - If you have doubts about Crossfit training, feel free to walk into a few CrossFit gyms in Pittsburgh and clarify them. Talk to the trainers and make sure that you are comfortable with them.