Oh yeah.... I agree. I have to say my 50kg(112lbs) friend is lucky Katie is so well behaved because that horse could literally ride through her every aide into outer space LOL.
I am around 67kg(148lbs) currently give or take a few pounds but a decade ago I was 114kg (252lbs) and before that quarter-life-crisis I was 57kg (126lb). So I've ridden skinny, I've ridden overweight and in-between at some point or other in my life and I wonder what direction the next hurdle will send me on the see-saw of life....
More weight means we have to work and ride EXTA better-than-usual to get the same response and then I found the response was more exaggerated, too, which was cool. There was no confusion - go is go, left is left, slow is slow, no BUCKING MEANS NO BUCKING! When I was at my heaviest I think I was around 95kg (210lbs) but I was amazed to be told I had a much lighter seat than the instructor was expecting in my assessment. I was both proud and mortified at the same time and I can recall with precision the 3rd degree burn travelling up my neck and face. I could also see the registered embarrassment on the other lesson clients and their audience too... >.<
These days I don't think I'd give a hoot.