The foam pit is highly important with many vaulting skills. The purpose of a foam pit is to offer an opportunity to practice a difficult skill without having to worry about the landing.
Still Frame 1 - The hands don't make contact at the same time.
Still Frame 2 - Ideally, when the body reaches vertical, the athlete should be off the vault
Still Frame 3 - Notice how the arms come in close to the body to speed up the twist.
Still Frame 4 - When the gymnast's body is up, he is perfectly straight and has completed a 180 degree turn