it's important during winter not to mention to my sensei (or even within earshot of him) how cold it is, or even give the impression that it's cold by shivering or hugging yourself, otherwise he feels obligated to ensure we're warmed up with seemingly endless cycles of 10 starjumps, 10 pushups, 10 stomach crunches, 10 leg lifts, etc. until most of us are dripping with sweat. then the class begins.