I remember practising diving once for my bronze medallion and just form getting in and out of the pool I ended up black and blue, my mum thought i'd been battered.
Used to do a lot of rock climbing too and was an RAF cadet which didn't help, always had bruises all over!
I was playing with my mate's dogs once and within hours my arms were just black with bruises, had to hide them from her so she didn't see them and feel bad.
My friend used to say that a cold hard stare at me and I'd be black and blue, so yes I constantly have bruises I can't explain. My little daughter is the exact same