hey guys, my sister posed an interesting question which i have not been able to find a definite answer to, though i am not sure there is one. She said she has a "tingling feeling" in her legs after working out, which consists of running on the eliptical for 40 min every other day. She said she has been running for the last 2 and a half months so i thought that would rule out anything related to just getting started. She could not further describe the feeling which i know is very vague, but any ideas would be great!