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Count Iblis
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http://online.wsj.com/article/SB10001424052748704350304574638331243027174.html
Doesn't sound like vigorous exercise to me at all. How on Earth can biking at a speed of 10 miles an hour be vigorous exercise?
Among vigorous-activity exercises are aerobic dance; biking faster than 10 miles an hour; heavy gardening (digging, hoeing); tennis (singles); jumping rope; swimming laps; hiking uphill; race walking, jogging or running.
Doesn't sound like vigorous exercise to me at all. How on Earth can biking at a speed of 10 miles an hour be vigorous exercise?