AB de Villiers says his troublesome back came through the first Test with flying colours, but he can't say the same for his South African team.
The batsman-wicketkeeper was ordered to spend three weeks resting before the Australian tour due to an ongoing back complaint.
He was pleased it didn't trouble him despite a stern work out in the drawn series opener in Brisbane.
"I felt really good in the first Test match, obviously I spent quite a bit of time on the field," de Villiers told reporters on Sunday in Adelaide ahead of the second Test starting Thursday.
"They put us out in the field for quite a few hours and my body did really well to go through that and I think it did me extremely well, to test it out and to see where I am at at the moment.
"And I think I passed with flying colours."
But de Villiers wasn't as glowing about the performance of the Proteas in Brisbane.
"The bowlers can improve and they know they can," he said.
"We had our chances, we had opportunities and we just didn't take them.
"There were a lot of edges and a lot of 50-50 chances didn't go our way."
The 78-Test veteran lamented South Africa's inability to press home an advantage with Australia 3-40 in the first innings - the hosts ultimately made 5(dec)-565.
"When we had them three down early on, I thought there was an opportunity to really run through the batting line-up," de Villiers said.
"We still created chances ... we just didn't take them, which is a bit of a worry.
"But at the end of the day you're not always going to bowl a team out for 150, 200, you sometimes have to work hard.
"We beat the bat a hell of a lot .. it looks pretty but it's not effective.
"For a really good bowling attack to beat the bat that much but not get the results is disappointing, but what can you do, it's millimetres we're talking about.
"But I believe we will improve in this Test match, we have learnt a lot of lessons."