5ft 3ins
I don't get any headbanging anymore but have learned how to ride it, arms up all the way round and relax, I think because people expect it to be rough they tense up so making it not such a good experience. We were told be one of the managers who was hosting one afternoon, to relax and let you body/head follow the track, and since following said advice the whole Collossus experience is so much better and now I look forward to riding.
Front row is still the best but being shorter I also love back row, (A-Kid cannot do even number rows has to front of each pair because his legs are too long so has to do 13,11,9,7,5,3,1)