The Terminator star, 70, was rushed to hospital earlier this month and underwent an emergency catheter valve replacement.
But Arnie seemed to be in good spirits in his latest Instagram video – which he recorded while he was sat at home in front of his chessboard.
He said: "Hello everybody! Just wanted to let you know that… thank you so much for all your wishes and for all the cards and the phone calls and the emails and texts that I get from around the world.
"I appreciate that very much.
"You're all very kind.
"I just want you to know that I'm feeling much better. I can't say, even with my positive attitude, that I'm great. Because I'm not great yet – great is a totally different level, but I'm good. I feel good.
"I get good care. Good doctors, good nurses. Everything is fantastic!
"I'm here at a chessboard, playing a little bit of chess, to freshen my mind and my memory a little bit and we move forward."
Schwarzenegger's fans were delighted to see the star on the mend.
One wrote: "Great to see you're doing well. Can't stop the Terminator!"
A second wrote: "Wishing you a prompt recovery"
A third said: "Prayers for continued healing champ!!!!"
According to US reports, Arnold had been initially taken to hospital for a catheter valve replacement.
But surgeons apparently hit complications during the “experimental” procedure and were forced to carry out open-heart surgery on the Red Sonya actor.
His spokesperson confirmed he was stable and said: “His first words were actually 'I’m back', so he is in good spirits.”
And pal Sylvester Stallone said the actor would be “bigger and better than ever” following his emergency surgery.
It isn't the first time the seven-time Mr Olympia has undergone heart surgery.
He was due to have a new pulmonic valve, which had been originally replaced due to a congenital heart defect in 1997.
In his biography, Total Recall: My Unbelievably True Life Story, he admitted that he hid the major procedure from his ex-wife Maria Shriver.
He later claimed he coped with his health problems by "ignoring how serious the operation" actually was.
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