An interesting example of this was watching my daughters ride their bikes around Mackinac Island last week while we were on bvacation/b and after the 8 mile ride all they wanted to do was sit in bed and read. b...../b Eg. The Forsythe/bVolek/b study : Reasonably well conducted, decent sample size and control and pretty decent length relatively speaking. However, the study did not prove; a) a metabolic advantage - self-reporting is an inherent flaw to prove or disprove. ...