When Shaun Denis wants to relax at work, he steps into a quiet room, outfitted with a few ferns and a chair. He slips on a virtual-reality headset and a pair of noise-cancelling headphones, and escapes to the beach. For Denis, the CEO of Ottawa, Canada-based real estate firm Umber Realty, those minutes are for solitary meditation. They're a tool he relies on regularly to both relieve and prevent stress.