He's back - and he's even posting updates on Twitter.

As you may have heard, Arnold Schwarzenegger had major heart surgery in recent days and the 70-year-old's reported first words after waking up were exactly what you might expect.

Now, he's taken to Twitter to give fans an update on his condition, explaining that he assumed that he would 'wake up with a small incision' but instead woke up with a 'big one' - but it sounds like he's aware of just how lucky he was to wake up at all.

See his tweet below:

Needless to say, fans were happy to hear the news...