Ive even found while out on the mountain bike, that its my left leg that gets unclipped when there is an obstruction to get over or pass close to.
Last night we did a lot of downhill stuff, just the way the route went, and standing on the pedals for yonks it was my left leg my main weight fell onto. Its my left leg that is tired today!

And strangely or not, its my left leg that has the bestest muscle contours on it too.
DOes veryone favour a particular leg. Im right handed if that makes a difference or not... OH... my setting off ie the first turn of the crank has to be the right leg!
Mary