Great idea to do the wave height challenge, but since you've put loads of pictures of half mast high waves, why haven't you put the internationally recognised, sit-on-the-fence size of "half mast high" to the list of possibles!?
Before we put up those options. We put it to a tribunal of 4,000 professionally trained chimps. Who all agreed that we couldn't include both half mast and head high.
Since we all really want to be surfers, we opted for the cooler option of head high.