Board Thread:Questions and Answers/@comment-34954086-20120922085545/@comment-4928331-20120923104244

Regulus22 wrote: Chemicals inducing an increased metabolism. Increase in metabolism leads to increased energy production. Energy tranforms from chemical to kinetic, k=1/2mv^2. v=velocity/ speed. This accounts fully for Kid Flash and Jay, although with Impulse & Barry's faster reaction time etc are more complex. give it some time, ill come back to it. One thing about increased metabolism though - why the heck did it take 40 days (he was injured on October 1; cast came off in November 11) for Kid Flash to heal from a broken arm? His injury was on the lower arm, which takes an average of six weeks in real life (42 days).

Finally, you will probably have to account for the chemicals giving Kid Flash/Flash additional lubrication in their tendons, as well as greater resistance to friction. All that moving around - at those speeds - is hell on your joints.