For personal influences, as seems to be popular in here, I always had a crush on the tomboy in school, who was always the best athlete and would challenge and beat the guys at arm wrestling, myself included (I feel like this is pretty much a right of passage haha).
Hmm, is that really a thing?
Funnily enough, I went one better than having a crush on the school tomboy, by palling around with a tomboy neighbour, when I went to visit one of my relatives in a small town a few times a year.
She was about 2 years older than me and shortly before secondary school when I was probably 11, we wrestled a few times one summer. I can't remember who challenged who but she probably started it because she would often try to assert her physical prowess and sometimes flexed a bicep to impress me and her friends (not that there really was a bicep there!).
The matches were close and we made each other work, but she was too strong and always ended up on top, really pleased with herself. It wasn't overtly sexual, but we would be alone in a back room of the house and as a pre-pubescent boy on the cusp of change, I was aware of a certain electrical charge and found it exhilirating to tussle with her.
It felt intimate and we both enjoyed it but although it felt nice lying underneath her in submission, she was really cocky and I did want to put her in her place sometimes, but I just wasn't able. I don't know if the age gap is sufficient explanation, as I don't think most girls just 2 years older would have been able to do that to me.
One time we weren't alone and wrestled in front of her younger sister who must have been my age or a fraction older, and after the older sister pinned me yet again, the younger one wanted a go with me. This memory has largely escaped me and I can't recall the final outcome, except that she was pretty strong too and it was all giggles, boasts and excitement.
Was this an influence or a formative experience though? I don't really think so, as I didn't see her again after that final summer and hardly thought about her for the next few decades. I think I was always intrigued by female strength and already had half-formed fantasies about it, and by the time I was 13, I was jerking off to Martina Navratilova's biceps.
It was another few years before I caught sight of the odd female bodybuilder on the cover of fitness magazines and that was always a wow moment, but it was the arrival of the internet in the 90s that really opened my eyes to the wonders of all those incredible muscular women.
Funnily enough, my experiences with the tomboy might have been as telling an indicator of her likes and inclinations as mine, as about two decades later, I heard she was in a lesbian relationship. I didn't think too much about it even then, but since then I've wondered if that's why she enjoyed being with a younger boy (and getting semi-physical ) rather than those her own age, whose interest in her at that age would have been more sexual (and very much vice versa, for most girls her age).
Maybe rolling around with a younger boy whom she could be in control with was a stepping stone to getting hands on with the weaker sex, ie. the rest of her own gender. Or maybe she was just fond of me and I'm talking shite ...