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Well... I'm not a crosfitter... Yet...
(sh.itjust.works)
General rules:
Exceptions may be made at the discretion of the mods.
Fair. Most Linux users I know cycle.
Much more gentle on the joints too.
And more efficient! First you're combining two tasks (commuting and exercise), and second you're burning the calories of a walk around a supermarket to get 6-7km away at about 15-20mph!