By being stronger than the force that's pushing against you.
Think about it, to every yin there is the yang, the opposite force. Walk into a wind tunnel (ok, I've never been in a wind tunnel, I'm just trying to make a point) you have to push against the force of the wind in order to move forward. If you just stand there you will, well just stand there. Not moving, exerting energy anyway just to keep yourself in place. Why not exert a little more energy and move forward?
We all stand in the wind tunnel from time to time. We get tired and need to take a break and that's ok. Just don't stand there too long or you will use all your energy just standing. You need to keep moving forward, one step at a time.