Americanismism

From the Blogger blog:

Not sure if you knew this already or not but we've got a couple different styles of Blogger tee shirts in the Googlestore. One of them looks like an old gym shirt—good for doing exercising between posts. Highly recommended for active bloggers.

I've never seen exercising used as a gerund before - is this just an American (ie: SAE) thing? We have the perfectly good word exercises which would have done here, and would have sounded a little more normal. Imagine what would happen if we all went this way:

Now we all have knowing of his doing exercising with his young lover.

It strangely sounds like German (but then right now everything sounds like German, because I've just returned from a Romance country).