Mainly is about high-intensity movements across a variety of equipment.
Some people can struggle in a gym, performing the same routine, not shifting any weight or gain any definition. Crossfit can help kickstart your progress.
You will need space and some equipment so it's probably best to get involved with your local fitness center first.
So you might be interested in crossfit, here you will find some information about crossfit, how it can help you achieve your goals and how to get started.Search crossfit events