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An absolute basic move, the start of everything.
The backhop is the most basic move to start understand most techniques in trials riding. Once you have that, it is quite easy to extend your skills to a few hops on the back wheel, before you can hop your way on the back wheel in any direction...
It is also a similar move that you'll need when launching a bunny hop or to climb sideways...So it's really hardcore basics.

Three phases smoothed in one move
1° Start from a stand still, brakes full-on, shift your weight on the back wheel. 2° Lift the front wheel and push on the legs to jump, extending the arms before lifting the bike. 3° When the back wheel takes off, pull your knees upwards and carry on lifting the bars.
4° After that, gravity pulls you back to earth, nothing special. Try to land on the back wheel first, it's smoother. See the move in a video

How to lift the bike in a bunny hop or back hop?
Lifting the handlebars is the only trick, because your feet can't lift the bike. It looks like the feet are stuck to the pedals, but in fact they are just limiting the ascension of the bike. During the extension, the arms are kept low to keep the rear wheel pushing on the ground, but as soon as the extension is over, its time to fold back the knees with a synchronised pull on the arms upwards to lift the whole bike. All the move takes less than a second.
video
Another blurred video.
The next step is to Bunny Hop over something. For the bunny hop, exaclty the same move except that you don't use the brakes. Do it at any speed you like.