The 50-50 is the easiest grind there is. You need to be able to Ollie when moving quite fast otherwise the board will not move when you hit the surface you want to grind on.
You need to take your run and then Ollie straighten your board so that your tricks will both land on the surface.
You must keep your feet on the nails and you have to keep your balance centered.
If it is a rail you are grinding on you need to tap the tail before you get to the end of the rail. This is so that the board will stay on your feet when you leave the rail.
If you need to clear a gap before you land you have to learn to Ollie on the rail.
