General fail

I’m clumsy. How do I know because it’s not overall clumsy. It’s bruising clumsy. Once in a while I’ll notice a new bruise or sometimes more than just one.
It’s more often that I know nothing of how the bruise got there on e.g. my thigh. So what explantion, besides clumsiness, could there be for these occasionally incidents?
I’ve got nothing so if you can enlighten me, then please do so in the comments…
Although, today was the exception to prove the rule. I was running on the running machine at the gym and when I paused it and got off to go fetch some more water I hit some “unseen” pointed edge. The time being it didn’t hurt that bad and I just got the water and continued running. It doesn’t end there because already when I was getting ready for a shower the bruise had become totally uncharmingly VISIBLE.
– What else can I do but to sigh from this clumsiness?
(It’s no little bruise. It’s…. Err ‘humongous!’)

Anyone else having a tendency to get bruises at random times?