Russell Wilson -- Hardcore Beach Training ... With Richard Sherman

The Seattle Seahawks stormed the beach in Hawaii this week ... for a full, hardcore workout session on the sand ... in front of a bunch of normies trying to relax on the sand.

It's pretty cool -- imagine you're on a lounge chair with your pina colada ... when all of the sudden Russell Wilson, Richard Sherman and the rest of the squad roll up and start wind-sprinting!

BTW -- Richard was wearing those 5-toed shoe thingies ... and the whole gang brought it together for a group huddle at the end of the training sesh.

Check out the pics.