Bolton's Muamba: If I can comeback from heart attack - I can do anything
While he says he finds it difficult to walk any distance without feeling tired, he says he will not rule out playing professional football again.
He has been building his fitness by taking short walks with his fiancee Shauna Magunday.
He told The Sun: "A few months ago I would think nothing of running miles, but now I'm tired after a 20-minute walk around the block.
"But now I'm making progress. It's too early to say whether I'll play football professionally again but I have great faith in God and I have hope, so who knows? If I can come back from the dead then perhaps I can achieve anything."