Australia's fastest woman says it has been horrendous.
While most athletes rested after last year's London Olympics, Canberra sprinter Melissa Breen embarked on her most gruelling training regime.
''I have never trained as hard as I have in the last six months,'' Breen said before Saturday night's Adelaide Track Classic.
''I was really motivated after that Olympic experience - it was amazing, but it wasn't the ultimate of my career.
''I still have to knuckle down and get faster and stronger.
''So I'm really excited the domestic season is starting. Now it's time to cash in on that hard work and not totally relax, but execute and just fly and see what happens.''
The intense training is already producing results - last weekend, Breen clocked 11.34 seconds for the 100 metres, just 0.07 seconds outside her personal best.
''Running this fast this early is unreal,'' said Breen, the national 100m and 200m champion.
But the 22-year-old pledged to never again face the same predicament as last year, when she raced around the world chasing a qualifying time for the Olympics.
''I don't regret doing what I did, I hadn't qualified and I wanted to, so as an athlete you have to do what you have to do,'' she said.
''And maybe I chased too much … I was a stress-head.
''Sure, I didn't get the qualifying time until two weeks before the Olympics but I did get it in the end. I just hope I'll never be in that position again.''
Having got to London, Breen's Olympics were ''better than I ever thought it was going to be''.
''The feeling I got when I walked out in the opening ceremony, I can't describe it … it was like the ultimate goal,'' she said.
Breen failed to progress past the 100m heats in London and while her race lasted just 11.34 seconds, said her Olympic experience would be everlasting.
''After I raced I went to every track event, every morning and every evening, and just watched everything, it was the best show on earth,'' Breen said.
''The sound of that stadium will stay with me forever, it was so loud, it made me shake.
''I just wanted to fully immerse myself in the Olympic spirit.'' AAP