Sherwood's team are still just three points above the relegation zone but two wins in their last three games and a FA Cup semi-final berth have created a feel good factor at the club.
Vlaar said: "Training feels really good, there's more energy, there's a high level of intensity and that's a good thing, I'm really pleased with that.
"So we're looking at the bright side now. It's a logical thing when a new gaffer comes in everyone has a new chance.
"You could see that back in training but it follows all over the place at Bodymoor, at Villa Park. Some good results helped as well."
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