They are recovering reasonably well. It was important for them to get a bit of rest and be fully fit heading into the next week, so I am sure they will go through the fitness testing protocol over the next day or two in order for them to be ready to go for the next week.
Set a target of 38 to win on the fourth day, after England were all out for 122 in their second innings, the Kiwis reached the target losing just two wickets
