Beginners trying handstands inevitably arch. After much training, most competitive gymnasts end up in positions something like this.
Dr. Dave Tilley looks at why most gymnasts don’t have great line in handstand – Assessing and Fixing The Dreaded “Pike Arch” Handstand: 6 Issues To Consider
The most complete coaching resource is the Handstand Homework Book. ($20)
Gymnastics Coaching.com 