Hiking

Oh dear, not much agreement here.  I still reckon you get your bum as far out as possible and your body more uprightish as Stefan suggests.  That way you are more locked into the boat and when you hit rough water you stay with the boat and put a lot less strain on the back.  You can also lean out a bit more for short periods when necessary.  Don't ever let you back go concave - you can imagine the forces when you hit a wave.  The Laser does require a more straight legged hike since otherwise your bum is in the water due to low freeboard.  Incidentally do you know that you can shorten your effective toe strap length by crossing your legs at the ankles to give a more upright stance for reaches.

The forecast is for light winds on Sunday - so you'll be able to practice the roll tacks.