Jordan Stout trudged into the Pacific Ocean at high tide. Far enough off the coast of San Diego that the water splashed his chin. Stout and two friends, one a fellow NFL punter, played a game: bury your foot into the ocean floor, lift the opposite knee and try to stay upright the longest against an avalanche of waves. Then another game: body surfing competition, chasing the tallest waves and riding them back to shore. They played Spikeball. And Pickleball. A few rounds of golf, too. Raiders punter AJ Cole, who shared in that nearly two-month West Coast excursion this summer, praised San Diego as a place they could “fully train and fully offseason at the same time.” It laid the groundwork for...