Chalk is not just something Olympic weightlifters and Lebron James needs. Chalk is essential to consistently gain strength in the gym. That's why you see chalk in every Starting Strength Gym. If you go to a gym that doesn't have chalk or even worse doesn't allow it, that gym is limiting your progress and you shouldn't be training there. Ray Gillenwater has some tips on how to use chalk your first time in the gym as well as why you need to be using chalk when strength training.