I have to agree with chris4stars. The more you ride the bigger you can go, I doubt anybody could do the size of gap they do today without alot of practise and getting to grips with the techniques. I started with trying to gap frm a line on a road to another marker, or from a curb to a road marking, now I can gap 5ft, which I am quite proud of as I have only been back riding a month or so. But moral for me is, practise, hone technique and have fun! Take it to serious you lose the reason you started to ride