Whenever you embark on a task, the tools you need are what will get you to where you want to go and help you achieve completing your task. Same for Strength & Conditioning, you need to have a good set of tools to help you achieve your fitness goals. Ask yourself how well-equipped your toolbox of training equipment (i.e. the gym you train at) is, and how many exercises you know you can perform with the available equipment. Do you have enough to give you the stimulus you require to train yourself to the level of fitness you desire?