I'd say if the person is at risk of injury because of what they are doing, then it's ok.
Also, if you've held conversations with the person on prior occasions and can approach the issue without looking like a smartass, it would be ok in that situation, too.
Just piping up and commenting on someone's exercise out of the blue, though, I think makes you look like an ass. ^_^
My 2 cents.
Also, if you've held conversations with the person on prior occasions and can approach the issue without looking like a smartass, it would be ok in that situation, too.
Just piping up and commenting on someone's exercise out of the blue, though, I think makes you look like an ass. ^_^
My 2 cents.