Raising A Fallen Bike

To pick up a relatively light bike, simply use your legs (not your back), take hold of the side of the handlebar, and lift.  Be prepared to put the kick stand down once the bike is upright.

To pick up a heavier motorcycle requires a different technique.  With your back to the bike, take hold of the handlebar with your right hand and the frame with your left, then simply walk the bike up with your legs.