Stuart Broad was delighted to return to form as England made New Zealand follow-on on day three at Wellington's Basin Reserve.
Sister act
Broad credited his conscientious sister Gemma - who works as England's video analyst - for his upturn in form.
Eagle-eyed Gemma's dedication to sifting through footage provided her brother with all the evidence he needed to identify and eradicate a technical glitch he believes was responsible for a loss of pace and accuracy.
"It was just looking at footage coming into this Test series," he said. "I got Gemma to get me all my Test wickets (on video) from 2010, and there was quite a big difference from where I was bowling a year ago - mid-crease - to throughout (last) summer, when I was very tight.
"It was a bit of a technical issue I was falling into, a bit of a bad habit, and I've managed to put that right.
"A lot of it is to do with just coming that bit wider on the crease. I got into a bad habit of getting too tight to the stumps, which meant my feet were crossed. I ended up having to push the ball straight.
"Now from a bit wider, I can really attack the stumps, and I don't think I'm as easy to leave."
An easing of the heel injury that forced him home early from the pre-Christmas tour of India has also helped.
"I managed to get my heel right over Christmas, and it's nice to be able to attack the crease with confidence - knowing 10 times your body weight is going through your heel, and it can withstand it," he added.
"It's it's almost getting used to the impact again, and touch wood I've not felt it for about two-and-a-half weeks. That's really encouraging and I feel confident - like I can tear in, and my speeds are pretty good as well."
Stiff back
Broad's pace colleague James Anderson spent a short time off the field in the final session, with a stiff back.
But he was still able to get through his share of overs, and England are optimistic he will be fine for Sunday.
Broad said: "I think he's okay. He's just torn into that wind for 20 overs and it's taken it out of him a little bit.
"This wind, howling through, can stiffen the body up quite badly. So it's about keeping mobile."
