For a sprint race, starting is an important phase. The main purpose of start is to achieve quick acceleration speed. For this the sprinters use crouch start using starting blocks. There are different types of start depending on spacing between two blocks and the distance between starting line and the first block. To determine the exact block spacing, the athlete and coach work together sometimes on a trial and error basis and sometimes on the basis of conventional ideas. There are a few research studies for analyzing the situation and providing right type of information. Present work is also a similar type of effort. The purpose was to study and analyze the influence of different block spacing on acceleration speed of the runner using both trained and untrained subjects. This book will be useful specially for the sprinters, coaches, Teachers and the students of Physical Education and Sports Science.