If you are interested in calisthenics and bodyweight training, then you might be intrigued by ‘The System’ developed by the Bar Brothers.
Bar Brothers is one of the most popular worldwide bodyweight training movements designed to build an athletic, muscular body with nothing more than your own body weight (and occasionally a heave bar).
Bar Brothers provide a 12-week progressive training programme for ‘newbies’, where you learn basic exercises before moving on to master more advanced exercises.
You can find a good review of the programme here, written by Gymless Steve the founder of Man vs. Weight.