Max Whitlock, known as a Pommel Horse specialist, proved to be a great gymnast in general today when he won the All Around title in the British Gymnastics Championships.  This video shows how great he is on Pommel Horse.  It is from the English Championships, at which he also won the All Around title.

He won the bronze medal at the Olympics on Pommel Horse.  But it appears that he is now branching out!

Strength Training for Young Athletes - 2e - William J. Kraemer - Paperback - Revised Ed.
Being a gymnast requires lots of strength.  This book can help you.