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Approachable, but challenging HIIT is the name of the game at Sanctuary Fitness, whose popular indoor-outdoor studio in the Arts District has given rise to offshoots in Pasadena, Koreatown and West Hollywood. A spiritual tilt (Sanctuary's mission includes helping clients find "peace through perspiration") means instructors emphasize kaizen, a Japanese philosophy focused on continuous improvement—so every little bit of effort in each workout counts.