You can't beat gymnastics for building a great all-round physique along with exceptional fitness, flexibility and endurance. Start young and keep going! Make time for fun, too!  But discipline is important too:    

 Gymnasts almost inevitably get themselves a great body image. They need strength with flexibility, and endurance to get through the routines. The younger they start, the better! The training is tough, and is usually augmented with lifting and bodyweight exercises. Great examples here, in all age groups. Gymnasts at work, rest and (occasionally) play! Now for some action:    

 Not everyone thinks that gymnastics is the greatest sport in the world - just us maybe, with acrobatic leanings. But without doubt it needs - and creates - extremely fit young people with well-developed strength while maintaining flexibility and endurance. So right now we celebrate that. It's mainly video action in this post, but we start some some cheerful 'big names' and also some guys having fun. Yes, I know we started with a still pic of the eventual outcome but, as you see here, it wasn't that easy! And, a finally, a young lad who's clearly a bit of a showoff (and embryo break dancer we think)...  ...and dad's justifiably proud of him!