Teammates David Warner and Mitchell Starc, reported for training on Monday as the domestic pre-season began behind closed doors at Sydney Olympic Park.
"I'm probably in the best shape I've been in in years, doing lots of running, lots of gym stuff at home. It's been a couple of months of good hard work," Smith was quoted as saying by Sydney Morning Herald.
Cricket Australia announced the international season last week, scheduled to begin from August 9.
"I haven't touched a bat, really. A couple of little drills at home but that's about it. I've just tried to switch off from it a bit, which I don't do very often. I was just focusing on getting myself fit and strong and refreshing mentally," said he.(UNI)