Stay in balance, parallel to the step you want to climb.
1° Flex backward on the bike to start a jump extension. That brings you really behind the seat.
2° Jump! Lifting the front wheel while at the same time giving a strong kick in the good pedal.
3° The pedal kick boosts your impulse and sends you off the ground, you should be in full extension.
4° Time to tuck back. Pull the bike upwards with the arms and fold up the knees to clear the way for the bike.
5° Still folding back, pull the bike upwards in front of you, start aiming the front wheel at where you want to land.
6° Once above the step, try to push back the front wheel downward onto the surface to land, that lifts further the rear.
See this move in a video
Once landed, try to keep your balance above the
bike. At the beginning, it's quite common to fall back
sideways, because your body is not enough aligned above the kerb.
See the eye focus on the landing area, from beginning to end.
Start on any street kerb and practice. The limiting factor to
your ascension?....humm...your legs.
You could climb sideways on small kerbs by just using a back hop
technique, but for higher obstacles, the backhop would not be
Combining the move with a pedal kick also prevents you from moving backwards and gives you more power upward. When taking your impulse, don't stop but try to do it in one go as a spring bouncing back. You can give it a slight turn to land precisely. You can also use that technique frontaly for low kerbs, and land directly on the back wheel, or with some practice, land sharp on the rear wheel, onto edges etc...
All the clips in one video
(or right-click to download the .wmv file)