Pietersen showed no ill effects from his recent Achilles injury problems
Kevin Pietersen was relieved to prove his fitness with a stylish unbeaten 53 as England beat Scotland by six wickets in a World Twenty20 warm-up match.
Pietersen missed the one-day series against West Indies with an Achilles problem but said: "I feel really good.
"I was diving in the field and haven't done that for years. Now I need to keep rehabilitating and keep myself right."
England play West Indies on Wednesday in their final warm-up match ahead of the start of the tournament on Friday.
Skipper Paul Collingwood was delighted with Pietersen's form and the way he chased down the target of 136-5 to help England home with six balls to spare at Trent Bridge.
"He's obviously raring to go, he's had a few weeks off through injury and he's got that buzz about him," said Collingwood.
"He's got a big smile on his face and I thought it was a really mature innings from him and we're going to need more of those kind of innings off him during the tournament."
England's performance came in for criticism but Collingwood said: "I was delighted with it, the way the boys stuck to the task.
"It would have been nice to blaze it all over the place but I thought they used their heads and got us over the line which is the thing you need to do against these sides.
"It's hard playing the minnows because they've got nothing to lose."
Looking ahead to Friday's opening ICC World Twenty20 match against the Netherlands, he said: "There are a couple of areas we need to look at without a doubt."
Spinner Adil Rashid, who has replaced Andrew Flintoff in the squad, conceded 31 runs from his three overs and Collingwood said: "He'll be a little disappointed with the boundaries he went for but he'll learn from that and I'm sure he'll bounce back from that."
James Anderson and Graeme Swann could both feature in Wednesday's match at Lord's after being rested as a precaution.
Scotland captain Gavin Hamilton praised his team's determination and told BBC Sport: "We put up a fantastic fight but we still have a lot to improve.
"Not only did we compete against a very good England side but we've come out of it thinking we've got a lot left in the tank.
In the build-up to the tournament, Scotland bowler John Blain walked out of the squad following a furious row with Hamilton.
"John was only with us for one afternoon, he's not been with us for the full season," the captain explained. "It happened, it was one of those things, the momentum of the side is exactly where we want to be the team ethos is absolutely outstanding."
We've got to learn from these guys, they're full-time professionals, if we can take these things we can only be a better side for it
Scotland captain Gavin Hamilton
Dimitri Mascarenhas took the new ball for England, while Stuart Broad conceded only two runs in a fine final over from around the wicket.
"They took us by surprise opening with Dimi when we were prepared to come hard at the quicker bowlers it took us a couple of overs to get into any momentum, but the middle order got us into a really good position," Hamilton said.
"The tactic of coming round the wicket was something we had never seen before, it did take us off guard and we were 20 or 30 short which would have been more than competitive.
"Cricket's going forward at such a pace we've got to keep up otherwise we are going to be left behind.
"It looks a fantastic tactic and we've got to learn from these guys, they're full-time professionals, if we can take these things we can only be a better side for it."
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