I'm blocks from the beach in Santa Monica and go down to original muscle beach early when no one is there with gloves and get great workout. It was good enough for classic bodybuilders in the 50's and 60's to do pull ups, dips and invented exercises. Fresh, salt air. Although some big boys might feel embarrassed when they see how strong they really are with wide grip chins, after impressing all the naive teenagers in the gym with the whole stack on lat pull downs.