An arrow cannot move forward without being pulled back. The more you pull it back the further it goes forward. It is kinda like life. We go through struggles that make us stronger and we become better because of it.
a Wave is symbolized as one of the strongest forces on earth. so strength for one. also if you read more into it, its about faith, a wave is you against mother nature, you cannot control it, you just have to put your faith into her.