### Clue: What your muscles may do on your bike (3,7)
### Answer: GET KNOTTED 
 ### Explanation: Definition: What your muscles may do,on your bike
  Double defn:  1st:  *Your muscles may* go into spasms, and then get knotted,form knots, which are painful abnormal areas in your muscles.  Presumably being *on your bike *for too long might cause this.  2nd:  An exclamation of rejection, "off you go!" or *on your bike!*   An &lit as well?