Mezzanine huh? Somehow I doubt that, you have some knowledge.
Since you asked:
Weight training and bodybuilding (natural) for the past 35 years, bodybuilding competition many years ago in the NPC, won the Pacific USA and West Coast as a 19 year old and qualified for the Nationals, did a tour with the USMC, trained with a couple of IFBB pros when I lived in California, was on the tug of war team (unique method in the Marines, speed strength), did slightly over 10.6 sprinting the 100m at my best, play around with a friend in his dojo kickboxing and grappling but nothing serious, still train intensely when the old body permits it, and still asked if I am competing in shows. I'm no heavyweight but OK for an old man of 45.
And I still get uncomfortable on sportbikes on the long haul.