Reset for loop index inside block

Experts,
Is there any reason why I can't reset the for loop index inside the loop?
I have a piece of code that does not behave and I can only come up with that reason.

What I want to do is:
for (var i=0;i<resultSet.rowCount();i++) {
   if (some condition) {
       i = i + 4; // skip over the next four rows
   }
}

Is there any reason to believe that the above would not work?