Getting started comes with many levels. You could be an athlete and getting started on military / spec ops level training.  That is a process. You could be a 50 yr old and have not done anything for 20 years except to gaining 5 lbs a year for the past decades. Getting started will be all about assessing strengths and weaknesses, building habits that include movement and nutrition, and breaking old habits that interfere with new goal progress. 

One Step at a time - https://www.stewsmithfitness.com/blogs/news/fitness-over-40-and-50-answers-to-your-concerns-one-step-at-a-time

Spec ops prep - start here - https://www.stewsmithfitness.com/blogs/news/spec-ops-prep-list-of-articles-research-one-stop-shop

For more information about military, special ops, police, and fire fighter physical preparation - check out https://www.StewSmithFitness.com for hundreds of articles, over 50 books, ebooks, and online coaching too.