I rate basketball as the toughest, full court sprinting with 4 or more games a week for 8 months is a serious workout. Cycling I would rate as #2 just because the season is shorter and there are gaps between events. But I am talking about a physical workout not getting the s**t kicked out of you like a cage match.
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The problem with the gene pool is that there is no lifeguard and the shallow end is much too large
2013 Noah RS