Just to clarify, I'm 19 stone and in winds above 12 mph, there is lots of pull. It can be a geat workout for a healthy person. It's effectively a parachute at the end of lines. Catches all of the wind and fast. I suggest you go for the 1.4. The 1.2 may be too small.
Yeah cheers for your advice, I am a big lad but do have a slight disability in the power in the arms,its the 1.4 I'm gonna go for,ta.