Can exercise cause slight increase alt and ast but still normal range with normal ggt, alk phos and bilirubin?

Possible: Ast and alt are very sensitive to to all kinds of things. Shake your liver around a little too much, drink a little too much alcohol, take the right combo of meds in a little excess or have a little dietary indiscretion and you can see mild increases in ast / alt. Normal levels are still normal and in general we don't get too concerned unless levels are greater than twice the upper limit of normal.