In diving, which of these is performed only from solid platforms?

Diving is the sport of jumping or falling into water from a platform or springboard, usually while performing acrobatics. Diving is an internationally recognized sport that is part of the Olympic Games. In addition, unstructured and non-competitive diving is a recreational pastime.

Armstand dive — a dive that's executed from a motionless armstand position on the edge of the platform. These are performed only from solid platforms and not the springboards.