Pays Tribute to Shad Gaspard

Another emotional tribute to ex-WWE superstar Shad Gaspard ... this time, it's Arnold Schwarzenegger calling Shad "the ultimate hero."

Arnold knew Shad from the legendary Gold's Gym in Venice -- where some of the top bodybuilders from around the world go to train.

It's clear Shad made an impression on Arnold -- not just from pumping iron -- but for just being an all around good dude.

In fact, so many people at the gym had love for Shad, they set up a memorial right in front ... and Tuesday morning, Arnold showed some love.

."On my bike ride today I stopped to pay respects to Shad Gaspard," Arnold said.

"He was such a positive force in the gym and the world. He was a hero in bodybuilding, a hero…